140 (number)
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140 is the natural number following 139 and preceding 141.
| Template:Numbers 100-200 | |
| Cardinal | One hundred [and] forty |
| Ordinal | 140th |
| Factorization | <math>2^2 \cdot 5 \cdot 7<math> |
| Divisors | 2, 5, 7, 10, 20, 28, 35, 70 |
| Roman numeral | CXL |
| Binary | 10001100 |
| Octal | 214 |
| Hexadecimal | 82 |
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 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 forty-one (141, CXLI) is the natural number following one hundred forty and preceding one hundred forty-two. It is a centered pentagonal number, and a composite number, and its factorization is
<math>141 = 3 \cdot 47.<math>
One hundred forty-one is also:
One hundred forty-two has its own article
One hundred 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
<math>143 = 11 \cdot 13.<math>
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 forty-three is also:
One hundred forty-four is its own article
One hundred forty-five has its own article
One hundred forty-six (146, CXLVI) is the natural number following one hundred forty-five and preceding one hundred forty-six. It is a triangular number and an octahedral number as well as a composite number, and its factorization is
<math>146 = 2 \cdot 73.<math>
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:
One hundred and forty-seven has its own page.
One hundred 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
<math>148 = 2^2 \cdot 37.<math>
One hundred 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.
One hundred and forty-nine has its own page.ko:140 sl:140 (število)