138407504 has 20 divisors (see below), whose sum is σ = 268438176. Its totient is φ = 69133152.

The previous prime is 138407501. The next prime is 138407509. The reversal of 138407504 is 405704831.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138407501) 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, 14117 + ... + 21819.

Almost surely, 2^138407504 is an apocalyptic number.

It is an amenable number.

138407504 is a deficient number, since it is larger than the sum of its proper divisors (130030672).

138407504 is a wasteful number, since it uses less digits than its factorization.

138407504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8834 (or 8828 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 138407504 is about 11764.6718611273. The cubic root of 138407504 is about 517.2730818401.

The spelling of 138407504 in words is "one hundred thirty-eight million, four hundred seven thousand, five hundred four".