138156680 has 32 divisors (see below), whose sum is σ = 315498240. Its totient is φ = 54436800.

The previous prime is 138156659. The next prime is 138156713. The reversal of 138156680 is 86651831.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23096 + ... + 28455.

It is an arithmetic number, because the mean of its divisors is an integer number (9859320).

Almost surely, 2^138156680 is an apocalyptic number.

138156680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138156680 is an abundant number, since it is smaller than the sum of its proper divisors (177341560).

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

138156680 is a wasteful number, since it uses less digits than its factorization.

138156680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51629 (or 51625 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 138156680 is about 11754.0069763464. The cubic root of 138156680 is about 516.9604230760.

The spelling of 138156680 in words is "one hundred thirty-eight million, one hundred fifty-six thousand, six hundred eighty".