138684556 has 12 divisors (see below), whose sum is σ = 245054992. Its totient is φ = 68668848.

The previous prime is 138684551. The next prime is 138684563. The reversal of 138684556 is 655486831.

138684556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (138684551) 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, 167895 + ... + 168718.

Almost surely, 2^138684556 is an apocalyptic number.

It is an amenable number.

138684556 is a deficient number, since it is larger than the sum of its proper divisors (106370436).

138684556 is a wasteful number, since it uses less digits than its factorization.

138684556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336720 (or 336718 counting only the distinct ones).

The product of its digits is 691200, while the sum is 46.

The square root of 138684556 is about 11776.4407186552. The cubic root of 138684556 is about 517.6179957624.

The spelling of 138684556 in words is "one hundred thirty-eight million, six hundred eighty-four thousand, five hundred fifty-six".