139605864 has 32 divisors (see below), whose sum is σ = 357133920. Its totient is φ = 45452736.

The previous prime is 139605841. The next prime is 139605871. The reversal of 139605864 is 468506931.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66607 + ... + 68670.

It is an arithmetic number, because the mean of its divisors is an integer number (11160435).

Almost surely, 2^139605864 is an apocalyptic number.

It is an amenable number.

139605864 is an abundant number, since it is smaller than the sum of its proper divisors (217528056).

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

139605864 is a wasteful number, since it uses less digits than its factorization.

139605864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135329 (or 135325 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 139605864 is about 11815.4925415744. The cubic root of 139605864 is about 518.7616786648.

The spelling of 139605864 in words is "one hundred thirty-nine million, six hundred five thousand, eight hundred sixty-four".