138138808 has 16 divisors (see below), whose sum is σ = 259193880. Its totient is φ = 69020448.

The previous prime is 138138779. The next prime is 138138817. The reversal of 138138808 is 808831831.

138138808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7710 + ... + 18322.

Almost surely, 2^138138808 is an apocalyptic number.

It is an amenable number.

138138808 is a deficient number, since it is larger than the sum of its proper divisors (121055072).

138138808 is a wasteful number, since it uses less digits than its factorization.

138138808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12246 (or 12242 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 138138808 is about 11753.2467003803. The cubic root of 138138808 is about 516.9381307166.

The spelling of 138138808 in words is "one hundred thirty-eight million, one hundred thirty-eight thousand, eight hundred eight".