140 (number)

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← 139 140 141 →
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.

In mathematics[edit]

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, 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 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[edit]

140 is also:

See also[edit]

References[edit]

  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[edit]