140 (number)

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← 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, cxl
Binary100011002
Ternary120123
Senary3526
Octal2148
DuodecimalB812
Hexadecimal8C16

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

In mathematics

140 is a square pyramidal number.

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.

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:

  • The former Twitter entry-character limit, a well-known characteristic of the service (based on the text messaging limit)
    • A film, based on the Twitter entry-character limit, created and edited by Frank Kelly of Ireland[2]

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