138615304 has 8 divisors (see below), whose sum is σ = 259903710. Its totient is φ = 69307648.

The previous prime is 138615287. The next prime is 138615313. The reversal of 138615304 is 403516831.

It can be written as a sum of positive squares in only one way, i.e., 100200100 + 38415204 = 10010^2 + 6198^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8663449 + ... + 8663464.

Almost surely, 2^138615304 is an apocalyptic number.

It is an amenable number.

138615304 is a deficient number, since it is larger than the sum of its proper divisors (121288406).

138615304 is a wasteful number, since it uses less digits than its factorization.

138615304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17326919 (or 17326915 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 138615304 is about 11773.5000743194. The cubic root of 138615304 is about 517.5318240676.

The spelling of 138615304 in words is "one hundred thirty-eight million, six hundred fifteen thousand, three hundred four".