400 (number)

← 399 400 401 →
List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	four hundred
Ordinal	400th (four hundredth)
Factorization	24 × 52
Divisors	1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400
Greek numeral	Υ´
Roman numeral	CD
Binary	1100100002
Ternary	1122113
Quaternary	121004
Quinary	31005
Senary	15046
Octal	6208
Duodecimal	29412
Hexadecimal	19016
Vigesimal	10020
Base 36	B436
Hebrew	ת (Tav)

400 (four hundred) is the natural number following 399 and preceding 401.

Mathematical properties

400 is the square of 20. 400 is the sum of the powers of 7 from 0 to 3, thus making it a repdigit in base 7 (1111).

A circle is divided into 400 grads, which is equal to 360 degrees and 2π radians. (Degrees and radians are the SI accepted units).

400 is a self number in base 10, since there is no integer that added to the sum of its own digits results in 400. On the other hand, 400 is divisible by the sum of its own base 10 digits, making it a Harshad number.

Other fields

Four hundred is also

• The Four Hundred (oligarchy) of ancient Athens.
• An HTTP status code for a bad client request.
• The Four Hundred (sometimes The Four Hundred Club) a phrase meaning the wealthiest, most famous, or most powerful social group (see, e.g., Ward McAllister), leading to the generation of such lists as the Forbes 400.
• The Atari 400 home computer.
• A former limited stop bus route which operated from Bolton to Stockport and Manchester Airport from 1970 to 2004, known as the Trans-Lancs Express.
• in the title of the film Les Quatre Cent Coups (The 400 Blows), a French film directed by François Truffaut.
• A Lebanese card game. 400 (card game)
• the designation for a class of Ontario highways called 400-Series Highways.
• The 400, later the Twin Cities 400, a Chicago and North Western Railway passenger train that traveled 400 miles between Minneapolis/St. Paul and Chicago, Illinois in 400 minutes.
• The yard number of the RMS Olympic, the RMS Titanic's sister ship.
• .400 (2 hits out of 5 at-bats) is a numerically significant annual batting average statistic in Major League Baseball, last accomplished by Ted Williams of the Boston Red Sox in 1941.
• The number of days in a Gregorian calendar year changes according to a cycle of exactly 400 years, of which 97 are leap years and 303 are common.
• The Intertestamental period or period of time between the writings of the Hebrew Bible and the Christian New Testament texts is traditionally considered to be a roughly four hundred-year period.
• The Sun is approximately 400 times the size of the Moon but also is approximately 400 times further away, creating the temporary illusion in which the Sun and Moon in Earth's sky appear as if of similar size.
• In gematria 400 is the largest single number that can be represented without using the Sophit forms (see Kaph, Mem, Nun, Pe, and Tzade).

Integers from 401 to 499

400s

401

A prime number, tetranacci number,^[1] sum of seven consecutive primes (43 + 47 + 53 + 59 + 61 + 67 + 71), sum of nine consecutive primes (29 + 31 + 37 + 41 + 43 + 47 + 53 + 59 + 61), Chen prime,^[2] Eisenstein prime with no imaginary part, Mertens function returns 0,^[3] member of the Mian–Chowla sequence.^[4]

• HTTP status code for "Unauthorized", area code for Rhode Island, also in the name of a retirement plan, 401(k). Stephen Colbert's Formula 401, a "man seed" based product brand his persona on The Colbert Report promotes for sale to the public [1].
• Ontario Highway 401, colloquially referred to as the four-oh-one, is a popular Canadian highway 817.9 kilometres (508.2 mi) that stretches from Windsor to the Quebec border, passing through Toronto. It turns into Quebec Autoroute 20 at the Quebec/Ontario border which leads to the cities of Montreal and Quebec.

402

402 = 2 × 3 × 67, sphenic number, nontotient, Harshad number,

• HTTP status code for "Payment Required", area code for Nebraska

403

403 = 13 × 31, Mertens function returns 0.^[3]

• First number that is the product of an emirp pair.^[5]
• HTTP status code for "Forbidden"
• Also in the name of a retirement plan in the United States, 403(b).
• The area code for southern Alberta.

404

404 = 2² × 101, Mertens function returns 0,^[3] nontotient, noncototient.

• HTTP status code for "Not Found", perhaps the most famous HTTP status code.
• Section 404 of the Sarbanes–Oxley Act.
• One of the three area codes of the Atlanta calling area.

405

405 = 3⁴ × 5, Mertens function returns 0,^[3] Harshad number;

• HTTP status code for "Method Not Allowed".
• Area code for central Oklahoma, including Oklahoma City and surrounding suburbs.

406

Wikisource has original text related to this article: 406

406 = 2 × 7 × 29, sphenic number, triangular number, centered nonagonal number,^[6] nontotient

• HTTP status code for "Not Acceptable".
• 406 is a poem by John Boyle O'Reilly. It was believed to have been the number of one of O'Reilly's prison cells, and was the number of his first hotel room after he arrived in the United States. Hence the number had a mystical significance to him, as intimated in the poem.
• See also the Peugeot 406 car.
• Area code for all of Montana.

407

407 = 11 × 37,

• sum of cubes of 4, 0 and 7 (4³ + 0³ + 7³ = 407); narcissistic number^[7]
• sum of three consecutive primes (131 + 137 + 139)
• Mertens function returns 0^[3]
• Harshad number
• HTTP status code for "Proxy Authentication Required"
• Area code for Orlando, Florida
• Colloquial name for the Express Toll Route in Ontario

408

408 = 2³ × 3 × 17

• Sum of four consecutive primes (97 + 101 + 103 + 107)
• Sum of eight consecutive primes (37 + 41 + 43 + 47 + 53 + 59 + 61 + 67)
• Pell number^[8]
• Mertens function returns 0^[3]
• Octagonal number^[9]
• Untouchable number^[10]
• Harshad number
• HTTP status code for "Request Timeout"
• Area code for the Silicon Valley

409

409 is a prime number, Chen prime,^[2] centered triangular number.^[11]

• A family of cleaning products, Formula 409
• An engine known as the Chevrolet 409, a 409 cubic inch W-series V8.
• The song "409" by The Beach Boys, inspired by the above engine
• HTTP status code for "Conflict"
• A Green Day song, 409 in Your Coffeemaker, included on their album 1,039/Smoothed Out Slappy Hours
• The area code for a part of eastern Texas
• Venice has 409 bridges.^[12]
• A Bullet For My Valentine song, "Room 409", from the album The Poison
• Joe Paterno holds the record as the winningest head coach in NCAA FBS with 409 victories.

410s

410

410 = 2 × 5 × 41, sphenic number, sum of six consecutive primes (59 + 61 + 67 + 71 + 73 + 79), nontotient, Harshad number

• HTTP status code for "Gone".
• Area Code 410, a telephone area code for the US State of Maryland, representing portions of the state including the Baltimore metropolitan area and the Eastern Shore.

411

411 = 3 × 137, self number,^[13]

• HTTP status code for "Length Required", slang for information (see 4-1-1)
• The number of possible FM broadcasting frequencies between 87.50 and 108.00 MHz in 50 kHz spacing countries^{[importance?]}

412

412 = 2² × 103, nontotient, noncototient, sum of twelve consecutive primes (13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47 + 53 + 59)

• HTTP status code for "Precondition Failed"
• Area code for Pittsburgh, Pennsylvania.
• Fictitious Police Code for "Overacting" from "St. George and the Dragonet" - Stan Freeberg

413

413 = 7 × 59, Mertens function returns 0,^[3] self number^[13]

• HTTP status code for "Request Entity Too Large"
• Area code for Western Massachusetts.

414

414 = 2 × 3² × 23, Mertens function returns 0,^[3] nontotient, Harshad number

• HTTP status code for "Request-URI Too Long"
• Area code for Milwaukee, Wisconsin.
• The 414s, a group of hackers from Milwaukee, Wisconsin.

415

415 = 5 × 83,

• HTTP status code for "Unsupported Media Type"
• 415 Records, a record label
• 415 refers to California Penal Code, section 415, pertaining to public fighting, public disturbance, and public use of offensive words likely to provoke an immediate violent reaction.
• Area code 415, a telephone area code for San Francisco, California

416

416 = 2⁵ × 13

• HTTP status code for "Requested Range Not Satisfiable"
• 416 is also a nickname for the city of Toronto, based on the area code it used before overlay plans added two more area codes.

417

417 = 3 × 139

• HTTP status code for "Expectation Failed". Also the area code for southwestern Missouri, including Springfield, and Joplin.

418

418 = 2 × 11 × 19, sphenic number,

• the number of Abrahadabra
• Hyper Text Coffee Pot Control Protocol status code for "Teapot" as an April Fools' joke.^[14][15]

419

A prime number, Sophie Germain prime,^[16] Chen prime, Eisenstein prime with no imaginary part, highly cototient number,^[17] Mertens function returns 0^[3]

• refers to the Nigerian advance fee fraud scheme (after the section of the Nigerian Criminal Code it violates)

420s

420

421

• A prime number, sum of five consecutive primes (73 + 79 + 83 + 89 + 97), centered square number,^[18] also SMTP code meaning the transmission channel will be closing
• Country calling code for Slovakia

422

422 = 2 × 211, Mertens function returns 0,^[3] nontotient

423

423 = 3² × 47, Mertens function returns 0,^[3] Harshad number

• Country calling code for Liechtenstein

424

424 = 2³ × 53, sum of ten consecutive primes (23 + 29 + 31 + 37 + 41 + 43 + 47 + 53 + 59 + 61), Mertens function returns 0,^[3] refactorable number,^[19] self number^[13]

425

425 = 5² × 17, pentagonal number,^[20] sum of three consecutive primes (137 + 139 + 149), Mertens function returns 0,^[3] the second number that can be expressed as the sum of two squares in three different ways (425 = 20² + 5² = 19² + 8² = 16² + 13² ).

• 425 is an area code in Washington State.

426

426 = 2 × 3 × 71, sphenic number, nontotient,

427

427 = 7 × 61, Mertens function returns 0^[3]

428

428 = 2² × 107, Mertens function returns 0, nontotient

• 428: Shibuya Scramble, a video game

429

429 = 3 × 11 × 13, sphenic number, Catalan number^[21]

430s

430

430 = 2 × 5 × 43, sphenic number, untouchable number^[10]

431

A prime number, Sophie Germain prime,^[16] sum of seven consecutive primes (47 + 53 + 59 + 61 + 67 + 71 + 73), Chen prime, Eisenstein prime with no imaginary part

• It is also the fourth Leyland prime of the second kind.
• The distance between Earth and the star Polaris in light years.
• Area code 431 is a telephone area code for Manitoba, Canada.

432

432 = 2⁴ × 3³ = 4² × 3³, The sum of four consecutive primes (103 + 107 + 109 + 113), a highly totient number,^[22] sum of totient function for first 37 integers. 432! is the first factorial that is not a Harshad number in base 10. 432 is also three-dozen sets of a dozen, making it three gross. An equilateral triangle whose area and perimeter are equal, has an area (and perimeter) equal to ${\displaystyle {\sqrt {432}}}$.

433

A prime number, Markov number,^[23] star number.^[24]

• The perfect score in the game show Fifteen To One, only ever achieved once in over 2000 shows.
• 433 can refer to composer John Cage's composition 4′33″ (pronounced "Four minutes, thirty-three seconds" or just "Four thirty-three").

434

434 = 2 × 7 × 31, sphenic number, sum of six consecutive primes (61 + 67 + 71 + 73 + 79 + 83), nontotient

435

435 = 3 × 5 × 29, sphenic number, triangular number, hexagonal number,^[25] self number^[13]

436

436 = 2² × 109, nontotient, noncototient

437

437 = 19 × 23

438

438 = 2 × 3 × 73, sphenic number, Smith number.^[26]

• The "438 match" or "438 game" has been used by cricket media to describe the famous 2006 One Day International in which Australia scored a world record 434 in their innings, only to see South Africa respond in their innings with 438.

439

A prime number, sum of three consecutive primes (139 + 149 + 151), sum of nine consecutive primes (31 + 37 + 41 + 43 + 47 + 53 + 59 + 61 + 67), strictly non-palindromic number^[27]

440s

440

440 = 2³ × 5 × 11, the sum of the first seventeen prime numbers, Harshad number,

• in hertz, the standard frequency to which most orchestras tune the pitch A above middle C. A few orchestras tune slightly flatter or sharper than this.

441

441 = 3² × 7² = 21²

• 441 is the sum of the cubes of the first 6 natural numbers (441 = 1³ + 2³ + 3³ + 4³ + 5³ + 6³).
• 441 is a centered octagonal number,^[28] a refactorable number,^[19] and a Harshad number.
• 441 is the number of squares on a Super Scrabble board.

442

442 = 2 × 13 × 17, sphenic number, sum of eight consecutive primes (41 + 43 + 47 + 53 + 59 + 61 + 67 + 71)

443

A prime number, Sophie Germain prime,^[16] Chen prime, Eisenstein prime with no imaginary part, Mertens function sets new low of -9, which stands until 659.

• In computing, it is the default port for HTTPS connections.

444

444 = 2² × 3 × 37, refactorable number,^[19] Harshad number.

445

445 = 5 × 89

446

446 = 2 × 223, nontotient, self number^[13]

447

447 = 3 × 149

448

448 = 2⁶ × 7, untouchable number,^[10] refactorable number,^[19] Harshad number

449

A prime number, sum of five consecutive primes (79 + 83 + 89 + 97 + 101), Chen prime, Eisenstein prime with no imaginary part, Proth prime.^[29] Also the largest number whose factorial is less than 10¹⁰⁰⁰

450s

450

450 = 2 × 3² × 5², nontotient, sum of totient function for first 38 integers, refactorable number,^[19] Harshad number,

• SMTP code meaning the requested mail action was not carried out.
• A perfect score in Canadian five-pin bowling.
• An area code in Southern Quebec.

451

451 = 11 × 41; 451 is a Wedderburn–Etherington number^[30] and a centered decagonal number;^[31] its reciprocal has period 10; 451 is the smallest number with this period reciprocal length.

• The novel Fahrenheit 451 refers to the temperature in Fahrenheit that author Ray Bradbury understood to be the autoignition point of paper.
• HTTP status code for "Unavailable For Legal Reasons" a HTTP response error when the user requests an illegal resource, such as a web page censored by a government.^[32]

452

452 = 2² × 113

• SMTP code meaning that the requested mail action was not carried out because of insufficient system storage

453

453 = 3 × 151

454

454 = 2 × 227, nontotient, a Smith number^[26]

455

455 = 5 × 7 × 13, sphenic number, tetrahedral number^[33]

• 455 Rocket is the title of a song by Kathy Mattea
• 455 kHz is a standard intermediate frequency for analog superheterodyne AM broadcast band receivers.

456

456 = 2³ × 3 × 19, sum of a twin prime (227 + 229), sum of four consecutive primes (107 + 109 + 113 + 127), centered pentagonal number^[34]

457

• A prime number, sum of three consecutive primes (149 + 151 + 157), self number.^[13]
• The international standard frequency for radio avalanche transceivers (457 kHz).

458

458 = 2 × 229, nontotient

459

459 = 3³ × 17

• 459 West 18th Street, a residential building at that address in Manhattan's West Chelsea neighborhood, built in 2008.

460s

460

460 = 2² × 5 × 23, centered triangular number,^[11] dodecagonal number,^[35] Harshad number, sum of twelve consecutive primes (17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47 + 53 + 59 + 61)

461

A prime number, Chen prime, sexy prime with 467, Eisenstein prime with no imaginary part

462

462 = 2 × 3 × 7 × 11, binomial coefficient ${\displaystyle {\tbinom {11}{5}}}$, sum of six consecutive primes (67 + 71 + 73 + 79 + 83 + 89), pronic number,^[36] sparsely totient number^[37]

463

A prime number, sum of seven consecutive primes (53 + 59 + 61 + 67 + 71 + 73 + 79), centered heptagonal number,^[38]

• Number of days in the synodic period of Ceres
• A common baseball double play (see baseball positions)
• A single by Buck 65, named after the baseball term

464

464 = 2⁴ × 29, primitive abundant number^[39]

• In chess it is the number of legal positions of the kings, not counting mirrored positions. Has some importance when constructing an endgame tablebase.
• See also: 4-6-4, the year AD 464.

465

465 = 3 × 5 × 31, sphenic number, triangular number, member of the Padovan sequence,^[40] Harshad number

466

466 = 2 × 233, noncototient

467

A prime number, safe prime,^[41] sexy prime with 461, Chen prime, Eisenstein prime with no imaginary part

468

468 = 2² × 3² × 13, sum of ten consecutive primes (29 + 31 + 37 + 41 + 43 + 47 + 53 + 59 + 61 + 67), refactorable number,^[19] self number,^[13] Harshad number

469

469 = 7 × 67, centered hexagonal number^[42]

470s

470

470 = 2 × 5 × 47, sphenic number, nontotient, noncototient

• In golf, 470 is the minimum length in yards from the tee to the hole on a Par 5.
• 470 is an Olympic class of sailing dinghy

471

471 = 3 × 157, sum of three consecutive primes (151 + 157 + 163), perfect totient number^[43]

472

472 = 2³ × 59, nontotient, untouchable number,^[10] refactorable number^[19]

473

473 = 11 × 43, sum of five consecutive primes (83 + 89 + 97 + 101 + 103)

474

474 = 2 × 3 × 79, sphenic number, sum of eight consecutive primes (43 + 47 + 53 + 59 + 61 + 67 + 71 + 73), nontotient, noncototient, sum of totient function for first 39 integers, untouchable number,^[10] nonagonal number^[44]

475

475 = 5² × 19, 49-gonal number, member of the Mian–Chowla sequence.^[4]

476

476 = 2² × 7 × 17, Harshad number

477

477 = 3² × 53, pentagonal number^[20]

478

478 = 2 × 239

479

A prime number, safe prime,^[41] sum of nine consecutive primes (37 + 41 + 43 + 47 + 53 + 59 + 61 + 67 + 71), Chen prime, Eisenstein prime with no imaginary part, self number^[13]

• Also an area code in the U.S. state of Arkansas.

480s

480

480 = 2⁵ × 3 × 5, sum of a twin prime (239 + 241), sum of four consecutive primes (109 + 113 + 127 + 131), highly totient number,^[22] refactorable number,^[19] Harshad number

481

481 = 13 × 37, octagonal number,^[9] centered square number,^[18] Harshad number

482

482 = 2 × 241, nontotient, noncototient

483

483 = 3 × 7 × 23, sphenic number, Smith number^[26]

484

484 = 2² × 11² = 22², nontotient

485

485 = 5 × 97

• RS-485

486

486 = 2 × 3⁵, Harshad number, Perrin number^[45]

• Shorthand for the Intel 80486 microprocessor chip.

487

A prime number, sum of three consecutive primes (157 + 163 + 167), Chen prime,

• The only primes under 7.74 × 10¹³ that divide their own decimal repetends are 3, 487, and 56598313.^[46]
• Shorthand for the Intel 80487 floating point processor chip.

488

488 = 2³ × 61, nontotient, refactorable number^[19]

489

489 = 3 × 163, octahedral number^[47]

490s

490

490 = 2 × 5 × 7², noncototient, sum of totient function for first 40 integers, partition number (integer partitions of 19),^[48] self number.^[13]

• The Christian Gospel of Matthew (Matthew 18:21-22) says that Jesus told Peter to forgive his brother "seventy times seven" times when his brother sins against him [2].

491

A prime number, Sophie Germain prime,^[16] Chen prime, Eisenstein prime with no imaginary part, strictly non-palindromic number^[27]

492

492 = 2² × 3 × 41, sum of six consecutive primes (71 + 73 + 79 + 83 + 89 + 97), refactorable number,^[19] member of a Ruth–Aaron pair with 493 under first definition

493

493 = 17 × 29, sum of seven consecutive primes (59 + 61 + 67 + 71 + 73 + 79 + 83), member of a Ruth–Aaron pair with 492 under first definition

494

494 = 2 × 13 × 19, sphenic number, nontotient

495

496

496 is the third perfect number, a number whose divisors add up to the actual number (1+2+4+8+16+31+62+124+248=496).

497

497 = 7 × 71, sum of five consecutive primes (89 + 97 + 101 + 103 + 107)

498

498 = 2 × 3 × 83, sphenic number, untouchable number,^[10] admirable number,^[49] abundant number

499

A prime number, Chen prime

References