138808656 has 60 divisors (see below), whose sum is σ = 443970592. Its totient is φ = 39659328.

The previous prime is 138808633. The next prime is 138808667. The reversal of 138808656 is 656808831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67846 + ... + 69861.

Almost surely, 2^138808656 is an apocalyptic number.

138808656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138808656 is an abundant number, since it is smaller than the sum of its proper divisors (305161936).

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

138808656 is a wasteful number, since it uses less digits than its factorization.

138808656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137728 (or 137719 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 138808656 is about 11781.7085348433. The cubic root of 138808656 is about 517.7723442212.

The spelling of 138808656 in words is "one hundred thirty-eight million, eight hundred eight thousand, six hundred fifty-six".