139617685 has 16 divisors (see below), whose sum is σ = 177687216. Its totient is φ = 104951808.

The previous prime is 139617679. The next prime is 139617713. The reversal of 139617685 is 586716931.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 33074001 + 106543684 = 5751^2 + 10322^2 .

It is a cyclic number.

It is not a de Polignac number, because 139617685 - 2³ = 139617677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78769 + ... + 80521.

It is an arithmetic number, because the mean of its divisors is an integer number (11105451).

Almost surely, 2^139617685 is an apocalyptic number.

It is an amenable number.

139617685 is a deficient number, since it is larger than the sum of its proper divisors (38069531).

139617685 is a wasteful number, since it uses less digits than its factorization.

139617685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2712.

The product of its digits is 272160, while the sum is 46.

The square root of 139617685 is about 11815.9927640465. The cubic root of 139617685 is about 518.7763201432.

The spelling of 139617685 in words is "one hundred thirty-nine million, six hundred seventeen thousand, six hundred eighty-five".