138991503732 has 12 divisors (see below), whose sum is σ = 324313508736. Its totient is φ = 46330501240.

The previous prime is 138991503713. The next prime is 138991503733. The reversal of 138991503732 is 237305199831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138991503733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5791312644 + ... + 5791312667.

It is an arithmetic number, because the mean of its divisors is an integer number (27026125728).

Almost surely, 2^138991503732 is an apocalyptic number.

138991503732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138991503732 is an abundant number, since it is smaller than the sum of its proper divisors (185322005004).

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

138991503732 is a wasteful number, since it uses less digits than its factorization.

138991503732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11582625318 (or 11582625316 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 51.

The spelling of 138991503732 in words is "one hundred thirty-eight billion, nine hundred ninety-one million, five hundred three thousand, seven hundred thirty-two".