138659612 has 36 divisors (see below), whose sum is σ = 303990120. Its totient is φ = 54853344.

The previous prime is 138659611. The next prime is 138659681. The reversal of 138659612 is 216956831.

It is a self number, because there is not a number n which added to its sum of digits gives 138659612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138659611) 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, 24662 + ... + 29757.

It is an arithmetic number, because the mean of its divisors is an integer number (8444170).

Almost surely, 2^138659612 is an apocalyptic number.

It is an amenable number.

138659612 is an abundant number, since it is smaller than the sum of its proper divisors (165330508).

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

138659612 is a wasteful number, since it uses less digits than its factorization.

138659612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54450 (or 54441 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 138659612 is about 11775.3816074045. The cubic root of 138659612 is about 517.5869607338.

The spelling of 138659612 in words is "one hundred thirty-eight million, six hundred fifty-nine thousand, six hundred twelve".