140 number

140 is the natural number following 139 and preceding 141.

Template:Numbers 100-200
Cardinal	One hundred [and] forty
Ordinal	140th
Factorization	$2^{2}\cdot 5\cdot 7$
Divisors	2, 5, 7, 10, 20, 28, 35, 70
Roman numeral	CXL
Binary	10001100
Octal	214
Hexadecimal	8c

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.

One hundred [and] forty is also:

• The designation of some spur routes of Interstate 40.
• The age Job died at (Holy Bible, Job 42:16).
• The year AD 140 or 140 BC.

Other numbers in the 140s

One hundred [and] forty-one has its own article.

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One hundred [and] forty-two has its own article.

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One hundred [and] forty-three (143, CXLIII) is the natural number following one hundred forty-two and preceding one hundred forty-four. It is a composite number, and its factorization is

$143=11\cdot 13.$

This number is the sum of three consecutive primes (43 + 47 + 53), as well as the sum of seven consecutive primes (11 + 13 + 17 + 19 + 23 + 29 + 31). But this number is never the sum of an integer and its base 10 digits, making it a self number.

Every positive integer is the sum of at most 143 seventh powers (see Waring's problem).

One hundred [and] forty-three is also:

• The year AD 143 or 143 BC.

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One hundred [and] forty-four has its own article.

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One hundred [and] forty-five has its own article.

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One hundred [and] forty-six (146, CXLVI) is the natural number following one hundred forty-five and preceding one hundred [and] forty-six. It is a triangular number and an octahedral number as well as a composite number, and its factorization is

$146=2\cdot 73.$

It is a nontotient since there is no integer with 146 coprimes below it, and an untouchable number since there is no integer whose proper divisors add up to 146.

One hundred forty-six is also:

• The year AD 146 or 146 BC.

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One hundred and forty-seven has its own article.

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One hundred [and] forty-eight (148, CXLVIII) is the natural number following one hundred forty-seven and preceding one hundred forty-eight. It is a heptagonal number and a centered heptagonal number. It is a composite number, and its factorization

$148=2^{2}\cdot 37.$

One hundred [and] forty-eight is also:

• The number of singers, sons of Asaph, at the Census of men of Israel upon return from exile (Holy Bible, Nehemiah 7:44).
• The year AD 148 or 148 BC.

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One hundred and forty-nine has its own article.