140 (number)

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139 140 141
Cardinal one hundred forty
Ordinal 140th
(one hundred and fortieth)
Factorization 22× 5 × 7
Divisors 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
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. 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[edit]

140 is also:

See also[edit]

References[edit]

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