140 (number)

← 139 140 141 →
← 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, cxl
Binary	100011002
Ternary	120123
Senary	3526
Octal	2148
Duodecimal	B812
Hexadecimal	8C16

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

External links

• The Natural Number 140
• The Number 140 at The Database of Number Correlations Archived 2017-06-30 at the Wayback Machine