138731564 has 12 divisors (see below), whose sum is σ = 243388488. Its totient is φ = 69192000.

The previous prime is 138731557. The next prime is 138731617. The reversal of 138731564 is 465137831.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41642 + ... + 44849.

It is an arithmetic number, because the mean of its divisors is an integer number (20282374).

Almost surely, 2^138731564 is an apocalyptic number.

It is an amenable number.

138731564 is a deficient number, since it is larger than the sum of its proper divisors (104656924).

138731564 is a wasteful number, since it uses less digits than its factorization.

138731564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86896 (or 86894 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 138731564 is about 11778.4363987755. The cubic root of 138731564 is about 517.6764724445.

The spelling of 138731564 in words is "one hundred thirty-eight million, seven hundred thirty-one thousand, five hundred sixty-four".