138599856 has 40 divisors (see below), whose sum is σ = 397834160. Its totient is φ = 46199808.

The previous prime is 138599837. The next prime is 138599893. The reversal of 138599856 is 658995831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 159985 + ... + 160848.

It is an arithmetic number, because the mean of its divisors is an integer number (9945854).

Almost surely, 2^138599856 is an apocalyptic number.

138599856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138599856 is an abundant number, since it is smaller than the sum of its proper divisors (259234304).

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

138599856 is a wasteful number, since it uses less digits than its factorization.

138599856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320850 (or 320838 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 54.

The square root of 138599856 is about 11772.8440064413. The cubic root of 138599856 is about 517.5125978870.

The spelling of 138599856 in words is "one hundred thirty-eight million, five hundred ninety-nine thousand, eight hundred fifty-six".