138557868 has 48 divisors (see below), whose sum is σ = 332403456. Its totient is φ = 44896320.

The previous prime is 138557821. The next prime is 138557873. The reversal of 138557868 is 868755831.

It is a self number, because there is not a number n which added to its sum of digits gives 138557868.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135198 + ... + 136218.

It is an arithmetic number, because the mean of its divisors is an integer number (6925072).

Almost surely, 2^138557868 is an apocalyptic number.

It is an amenable number.

138557868 is an abundant number, since it is smaller than the sum of its proper divisors (193845588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138557868 is a wasteful number, since it uses less digits than its factorization.

138557868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334 (or 1332 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 51.

The square root of 138557868 is about 11771.0606149149. The cubic root of 138557868 is about 517.4603334902.

The spelling of 138557868 in words is "one hundred thirty-eight million, five hundred fifty-seven thousand, eight hundred sixty-eight".