139945680 has 120 divisors (see below), whose sum is σ = 537144192. Its totient is φ = 31986432.

The previous prime is 139945679. The next prime is 139945681. The reversal of 139945680 is 86549931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (139945679) and next prime (139945681).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139945681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8844 + ... + 18923.

Almost surely, 2^139945680 is an apocalyptic number.

139945680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139945680 is an abundant number, since it is smaller than the sum of its proper divisors (397198512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139945680 is a wasteful number, since it uses less digits than its factorization.

139945680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27793 (or 27784 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 139945680 is about 11829.8639045426. The cubic root of 139945680 is about 519.1822452406.

Subtracting from 139945680 its product of nonzero digits (233280), we obtain a square (139712400 = 11820²).

It can be divided in two parts, 139945 and 680, that added together give a square (140625 = 375²).

The spelling of 139945680 in words is "one hundred thirty-nine million, nine hundred forty-five thousand, six hundred eighty".