138331539 has 12 divisors (see below), whose sum is σ = 200216016. Its totient is φ = 92034672.

The previous prime is 138331513. The next prime is 138331541. The reversal of 138331539 is 935133831.

It is a happy number.

138331539 is a `hidden beast` number, since 13 + 83 + 31 + 539 = 666.

138331539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138331539 - 2¹¹ = 138329491 is a prime.

It is a super-2 number, since 2×138331539² = 38271229364217042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138331139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10752 + ... + 19805.

It is an arithmetic number, because the mean of its divisors is an integer number (16684668).

Almost surely, 2^138331539 is an apocalyptic number.

138331539 is a deficient number, since it is larger than the sum of its proper divisors (61884477).

138331539 is a wasteful number, since it uses less digits than its factorization.

138331539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31066 (or 31063 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 138331539 is about 11761.4428961756. The cubic root of 138331539 is about 517.1784293593.

The spelling of 138331539 in words is "one hundred thirty-eight million, three hundred thirty-one thousand, five hundred thirty-nine".