139079920 has 40 divisors (see below), whose sum is σ = 369556704. Its totient is φ = 47684352.

The previous prime is 139079917. The next prime is 139079921. The reversal of 139079920 is 29970931.

139079920 = 76² + 77² + ... + 747².

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139079921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123619 + ... + 124738.

Almost surely, 2^139079920 is an apocalyptic number.

139079920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139079920 is an abundant number, since it is smaller than the sum of its proper divisors (230476784).

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

139079920 is a wasteful number, since it uses less digits than its factorization.

139079920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248377 (or 248371 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 139079920 is about 11793.2149984642. The cubic root of 139079920 is about 518.1094067838.

The spelling of 139079920 in words is "one hundred thirty-nine million, seventy-nine thousand, nine hundred twenty".