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, 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 number. 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 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^[1]
• The age that Job died at (Bible, Job 42:16)
• 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

See also

• List of highways numbered 140
• United Nations Security Council Resolution 140
• United States Supreme Court cases, Volume 140

References

External links

Wikimedia Commons has media related to 140 (number).

• The Natural Number 140
• The Number 140 at The Database of Number Correlations