138537020 has 12 divisors (see below), whose sum is σ = 290927784. Its totient is φ = 55414800.

The previous prime is 138537019. The next prime is 138537041. The reversal of 138537020 is 20735831.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3463406 + ... + 3463445.

It is an arithmetic number, because the mean of its divisors is an integer number (24243982).

Almost surely, 2^138537020 is an apocalyptic number.

138537020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138537020 is an abundant number, since it is smaller than the sum of its proper divisors (152390764).

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

138537020 is a wasteful number, since it uses less digits than its factorization.

138537020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6926860 (or 6926858 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 138537020 is about 11770.1750199392. The cubic root of 138537020 is about 517.4343791019.

The spelling of 138537020 in words is "one hundred thirty-eight million, five hundred thirty-seven thousand, twenty".