138709572120 has 128 divisors (see below), whose sum is σ = 528417446400. Its totient is φ = 31705043328.

The previous prime is 138709572109. The next prime is 138709572187. The reversal of 138709572120 is 21275907831.

138709572120 is a `hidden beast` number, since 1 + 3 + 8 + 70 + 9 + 572 + 1 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9166354 + ... + 9181473.

It is an arithmetic number, because the mean of its divisors is an integer number (4128261300).

Almost surely, 2^138709572120 is an apocalyptic number.

138709572120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138709572120 is an abundant number, since it is smaller than the sum of its proper divisors (389707874280).

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

138709572120 is a wasteful number, since it uses less digits than its factorization.

138709572120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18347854 (or 18347844 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 138709572120 in words is "one hundred thirty-eight billion, seven hundred nine million, five hundred seventy-two thousand, one hundred twenty".