140 (number)

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. 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 number of varieties of ashes from different varieties of pipe, cigar, and cigarette tobacco included in the Sherlock Holmes monograph.
 * 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
 * The age at which Job died
 * The atomic number of unquadnilium, a temporary chemical element
 * PRO 140 antibody found on T lymphocytes of the human immune system
 * Telephone directory assistance in Egypt
 * A video game developed by Jeppe Carlsen
 * The BPM (tempo) of the music genre Dubstep