138539522 has 16 divisors (see below), whose sum is σ = 227074752. Its totient is φ = 62868720.

The previous prime is 138539521. The next prime is 138539539. The reversal of 138539522 is 225935831.

It is not an unprimeable number, because it can be changed into a prime (138539521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9368 + ... + 19100.

It is an arithmetic number, because the mean of its divisors is an integer number (14192172).

Almost surely, 2^138539522 is an apocalyptic number.

138539522 is a deficient number, since it is larger than the sum of its proper divisors (88535230).

138539522 is a wasteful number, since it uses less digits than its factorization.

138539522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10393.

The product of its digits is 64800, while the sum is 38.

The square root of 138539522 is about 11770.2813050496. The cubic root of 138539522 is about 517.4374940648.

The spelling of 138539522 in words is "one hundred thirty-eight million, five hundred thirty-nine thousand, five hundred twenty-two".