140 (number)

Short description: Natural number

| <- 139  | 140 |  141 ->

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← 140 141 142 143 144 145 146 147 148 149 →

List of numbers — Integers

← 0 100 200 300 400 500 600 700 800 900 →

Cardinal| one hundred forty
Ordinal| 140th
(one hundred fortieth)
Factorization| 22 × 5 × 7
Divisors| 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
Greek numeral| ΡΜ´
Roman numeral| CXL
Binary| 100011002
Ternary| 120123
Quaternary| 20304
Quinary| 10305
Senary| 3526
Octal| 2148
Duodecimal| B812
Hexadecimal| 8C16
Vigesimal| 7020
Base 36| 3W36

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

## Contents

* 1 In mathematics
* 2 In other fields
* 3 See also
* 4 References
* 5 External links

## 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.

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[2]
* The age at which Job died[3]
* 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

## See also

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

## References

1. ↑ "Sloane's A001599 : Harmonic or Ore numbers". OEIS Foundation. https://oeis.org/A001599.
2. ↑ Wired.com - June 23, 2009
3. ↑ Job 42:16

## External links

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

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