138015256 has 16 divisors (see below), whose sum is σ = 260082000. Its totient is φ = 68660064.

The previous prime is 138015247. The next prime is 138015271. The reversal of 138015256 is 652510831.

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, 41755 + ... + 44938.

It is an arithmetic number, because the mean of its divisors is an integer number (16255125).

Almost surely, 2^138015256 is an apocalyptic number.

It is an amenable number.

138015256 is a deficient number, since it is larger than the sum of its proper divisors (122066744).

138015256 is a wasteful number, since it uses less digits than its factorization.

138015256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86898 (or 86894 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 138015256 is about 11747.9894450072. The cubic root of 138015256 is about 516.7839674470.

The spelling of 138015256 in words is "one hundred thirty-eight million, fifteen thousand, two hundred fifty-six".