138476808 has 24 divisors (see below), whose sum is σ = 375041550. Its totient is φ = 46158912.

The previous prime is 138476773. The next prime is 138476837. The reversal of 138476808 is 808674831.

It can be written as a sum of positive squares in only one way, i.e., 114447204 + 24029604 = 10698^2 + 4902^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 961573 + ... + 961716.

Almost surely, 2^138476808 is an apocalyptic number.

138476808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138476808 is an abundant number, since it is smaller than the sum of its proper divisors (236564742).

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

138476808 is a wasteful number, since it uses less digits than its factorization.

138476808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923301 (or 1923294 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 138476808 is about 11767.6169210253. The cubic root of 138476808 is about 517.3594045003.

The spelling of 138476808 in words is "one hundred thirty-eight million, four hundred seventy-six thousand, eight hundred eight".