138904472 has 32 divisors (see below), whose sum is σ = 300011520. Its totient is φ = 59058720.

The previous prime is 138904457. The next prime is 138904517. The reversal of 138904472 is 274409831.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2654 + ... + 16877.

It is an arithmetic number, because the mean of its divisors is an integer number (9375360).

Almost surely, 2^138904472 is an apocalyptic number.

It is an amenable number.

138904472 is an abundant number, since it is smaller than the sum of its proper divisors (161107048).

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

138904472 is a wasteful number, since it uses less digits than its factorization.

138904472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19671 (or 19667 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 138904472 is about 11785.7741366446. The cubic root of 138904472 is about 517.8914517411.

The spelling of 138904472 in words is "one hundred thirty-eight million, nine hundred four thousand, four hundred seventy-two".