138815312 has 20 divisors (see below), whose sum is σ = 269580960. Its totient is φ = 69246048.

The previous prime is 138815297. The next prime is 138815317. The reversal of 138815312 is 213518831.

138815312 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138815317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2858 + ... + 16905.

It is an arithmetic number, because the mean of its divisors is an integer number (13479048).

Almost surely, 2^138815312 is an apocalyptic number.

It is an amenable number.

138815312 is a deficient number, since it is larger than the sum of its proper divisors (130765648).

138815312 is a wasteful number, since it uses less digits than its factorization.

138815312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20210 (or 20204 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 138815312 is about 11781.9910032218. The cubic root of 138815312 is about 517.7806199722.

The spelling of 138815312 in words is "one hundred thirty-eight million, eight hundred fifteen thousand, three hundred twelve".