138615556 has 12 divisors (see below), whose sum is σ = 242966080. Its totient is φ = 69196680.

The previous prime is 138615553. The next prime is 138615559. The reversal of 138615556 is 655516831.

It is an interprime number because it is at equal distance from previous prime (138615553) and next prime (138615559).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (138615551) 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, 24936 + ... + 29983.

Almost surely, 2^138615556 is an apocalyptic number.

It is an amenable number.

138615556 is a deficient number, since it is larger than the sum of its proper divisors (104350524).

138615556 is a wasteful number, since it uses less digits than its factorization.

138615556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55554 (or 55552 counting only the distinct ones).

The product of its digits is 108000, while the sum is 40.

The square root of 138615556 is about 11773.5107763148. The cubic root of 138615556 is about 517.5321376885.

The spelling of 138615556 in words is "one hundred thirty-eight million, six hundred fifteen thousand, five hundred fifty-six".