138604845 has 16 divisors (see below), whose sum is σ = 222823872. Its totient is φ = 73570560.

The previous prime is 138604819. The next prime is 138604889. The reversal of 138604845 is 548406831.

It is a de Polignac number, because none of the positive numbers 2^k-138604845 is a prime.

It is a super-2 number, since 2×138604845² = 38422606114948050, which contains 22 as substring.

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, 18732 + ... + 25061.

It is an arithmetic number, because the mean of its divisors is an integer number (13926492).

Almost surely, 2^138604845 is an apocalyptic number.

138604845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138604845 is a deficient number, since it is larger than the sum of its proper divisors (84219027).

138604845 is a wasteful number, since it uses less digits than its factorization.

138604845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44012.

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 138604845 is about 11773.0558904645. The cubic root of 138604845 is about 517.5188072233.

The spelling of 138604845 in words is "one hundred thirty-eight million, six hundred four thousand, eight hundred forty-five".