138638696 has 32 divisors (see below), whose sum is σ = 306670080. Its totient is φ = 57499200.

The previous prime is 138638681. The next prime is 138638701. The reversal of 138638696 is 696836831.

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, 38195 + ... + 41666.

It is an arithmetic number, because the mean of its divisors is an integer number (9583440).

Almost surely, 2^138638696 is an apocalyptic number.

It is an amenable number.

138638696 is an abundant number, since it is smaller than the sum of its proper divisors (168031384).

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

138638696 is a wasteful number, since it uses less digits than its factorization.

138638696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79905 (or 79901 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 50.

The square root of 138638696 is about 11774.4934498262. The cubic root of 138638696 is about 517.5609344260.

The spelling of 138638696 in words is "one hundred thirty-eight million, six hundred thirty-eight thousand, six hundred ninety-six".