138394564140 has 72 divisors (see below), whose sum is σ = 450770875632. Its totient is φ = 31633042560.

The previous prime is 138394564127. The next prime is 138394564153. The reversal of 138394564140 is 41465493831.

It is an interprime number because it is at equal distance from previous prime (138394564127) and next prime (138394564153).

It is a self number, because there is not a number n which added to its sum of digits gives 138394564140.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23533551 + ... + 23539430.

It is an arithmetic number, because the mean of its divisors is an integer number (6260706606).

Almost surely, 2^138394564140 is an apocalyptic number.

138394564140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138394564140 is an abundant number, since it is smaller than the sum of its proper divisors (312376311492).

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

138394564140 is a wasteful number, since it uses less digits than its factorization.

138394564140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47073007 (or 47072998 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 138394564140 in words is "one hundred thirty-eight billion, three hundred ninety-four million, five hundred sixty-four thousand, one hundred forty".