138604689 has 60 divisors (see below), whose sum is σ = 228231168. Its totient is φ = 83721600.

The previous prime is 138604679. The next prime is 138604691. The reversal of 138604689 is 986406831.

138604689 is a `hidden beast` number, since 1 + 38 + 604 + 6 + 8 + 9 = 666.

It is not a de Polignac number, because 138604689 - 2⁵ = 138604657 is a prime.

It is a super-2 number, since 2×138604689² = 38422519625573442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138604619) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 725584 + ... + 725774.

Almost surely, 2^138604689 is an apocalyptic number.

It is an amenable number.

138604689 is a deficient number, since it is larger than the sum of its proper divisors (89626479).

138604689 is a wasteful number, since it uses less digits than its factorization.

138604689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 138604689 is about 11773.0492651649. The cubic root of 138604689 is about 517.5186130671.

The spelling of 138604689 in words is "one hundred thirty-eight million, six hundred four thousand, six hundred eighty-nine".