140 (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.

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]