139031956 has 24 divisors (see below), whose sum is σ = 279530496. Its totient is φ = 59270880.

The previous prime is 139031953. The next prime is 139031983. The reversal of 139031956 is 659130931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139031951) 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, 7651 + ... + 18346.

It is an arithmetic number, because the mean of its divisors is an integer number (11647104).

Almost surely, 2^139031956 is an apocalyptic number.

It is an amenable number.

139031956 is an abundant number, since it is smaller than the sum of its proper divisors (140498540).

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

139031956 is a wasteful number, since it uses less digits than its factorization.

139031956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26199 (or 26197 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 139031956 is about 11791.1812809404. The cubic root of 139031956 is about 518.0498404164.

The spelling of 139031956 in words is "one hundred thirty-nine million, thirty-one thousand, nine hundred fifty-six".