138887794188 has 72 divisors (see below), whose sum is σ = 412454676816. Its totient is φ = 38849731200.

The previous prime is 138887794187. The next prime is 138887794193. The reversal of 138887794188 is 881497788831.

138887794188 is a `hidden beast` number, since 1 + 388 + 87 + 7 + 94 + 1 + 88 = 666.

It is not an unprimeable number, because it can be changed into a prime (138887794187) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13484343 + ... + 13494638.

It is an arithmetic number, because the mean of its divisors is an integer number (5728537178).

Almost surely, 2^138887794188 is an apocalyptic number.

138887794188 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138887794188 is an abundant number, since it is smaller than the sum of its proper divisors (273566882628).

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

138887794188 is a wasteful number, since it uses less digits than its factorization.

138887794188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26979015 (or 26979010 counting only the distinct ones).

The product of its digits is 173408256, while the sum is 72.

The spelling of 138887794188 in words is "one hundred thirty-eight billion, eight hundred eighty-seven million, seven hundred ninety-four thousand, one hundred eighty-eight".