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140 (number)

← 139 140 141 →
Cardinalone hundred forty
Ordinal140th
(one hundred fortieth)
Factorization22 × 5 × 7
Divisors1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
Greek numeralΡΜ´
Roman numeralCXL
Binary100011002
Ternary120123
Quaternary20304
Quinary10305
Senary3526
Octal2148
DuodecimalB812
Hexadecimal8C16
Vigesimal7020
Base 363W36

140 (one hundred [and] forty) is the natural number following 139 and preceding 141.

In mathematics

140 is an abundant number and a harmonic divisor number.[1] It is the sum of the squares of the first seven integers, which makes it a square pyramidal number, and in base 10 it is divisible by the sum of its digits, which makes it a Harshad number.

140 is an odious number because it has an odd number of ones in its binary representation. The sum of Euler's totient function φ(x) over the first twenty-one integers is 140.

140 is a repdigit in bases 13, 19, 27, 34, 69, and 139.

In other fields

140 is also:

See also

References

  1. ^ "Sloane's A001599 : Harmonic or Ore numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.
  2. ^ Wired.com - June 23, 2009

External links