138819556 has 12 divisors (see below), whose sum is σ = 243613440. Its totient is φ = 69215720.

The previous prime is 138819517. The next prime is 138819587. The reversal of 138819556 is 655918831.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46900 + ... + 49771.

It is an arithmetic number, because the mean of its divisors is an integer number (20301120).

Almost surely, 2^138819556 is an apocalyptic number.

It is an amenable number.

138819556 is a deficient number, since it is larger than the sum of its proper divisors (104793884).

138819556 is a wasteful number, since it uses less digits than its factorization.

138819556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97034 (or 97032 counting only the distinct ones).

The product of its digits is 259200, while the sum is 46.

The square root of 138819556 is about 11782.1711072281. The cubic root of 138819556 is about 517.7858966201.

The spelling of 138819556 in words is "one hundred thirty-eight million, eight hundred nineteen thousand, five hundred fifty-six".