138539564 has 24 divisors (see below), whose sum is σ = 255951360. Its totient is φ = 65432016.

The previous prime is 138539563. The next prime is 138539617. The reversal of 138539564 is 465935831.

It is not an unprimeable number, because it can be changed into a prime (138539561) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 25409 + ... + 30375.

It is an arithmetic number, because the mean of its divisors is an integer number (10664640).

Almost surely, 2^138539564 is an apocalyptic number.

It is an amenable number.

138539564 is a deficient number, since it is larger than the sum of its proper divisors (117411796).

138539564 is a wasteful number, since it uses less digits than its factorization.

138539564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5357 (or 5355 counting only the distinct ones).

The product of its digits is 388800, while the sum is 44.

The square root of 138539564 is about 11770.2830892039. The cubic root of 138539564 is about 517.4375463540.

The spelling of 138539564 in words is "one hundred thirty-eight million, five hundred thirty-nine thousand, five hundred sixty-four".