138537732340 has 72 divisors (see below), whose sum is σ = 340146271080. Its totient is φ = 47257475328.

The previous prime is 138537732313. The next prime is 138537732353. The reversal of 138537732340 is 43237735831.

It can be written as a sum of positive squares in 4 ways, for example, as 46803860964 + 91733871376 = 216342^2 + 302876^2 .

It is a congruent number.

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, 165735 + ... + 551854.

It is an arithmetic number, because the mean of its divisors is an integer number (4724253765).

Almost surely, 2^138537732340 is an apocalyptic number.

138537732340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138537732340 is an abundant number, since it is smaller than the sum of its proper divisors (201608538740).

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

138537732340 is a wasteful number, since it uses less digits than its factorization.

138537732340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717809 (or 717800 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 46.

The spelling of 138537732340 in words is "one hundred thirty-eight billion, five hundred thirty-seven million, seven hundred thirty-two thousand, three hundred forty".