138256804 has 24 divisors (see below), whose sum is σ = 286050240. Its totient is φ = 57209376.

The previous prime is 138256793. The next prime is 138256813. The reversal of 138256804 is 408652831.

It is a happy number.

It is a super-2 number, since 2×138256804² = 38229887704588832, which contains 22 as substring.

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, 84322 + ... + 85945.

It is an arithmetic number, because the mean of its divisors is an integer number (11918760).

Almost surely, 2^138256804 is an apocalyptic number.

138256804 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138256804 is an abundant number, since it is smaller than the sum of its proper divisors (147793436).

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

138256804 is a wasteful number, since it uses less digits than its factorization.

138256804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170307 (or 170305 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 138256804 is about 11758.2653482561. The cubic root of 138256804 is about 517.0852756387.

The spelling of 138256804 in words is "one hundred thirty-eight million, two hundred fifty-six thousand, eight hundred four".