138759912 has 32 divisors (see below), whose sum is σ = 385444800. Its totient is φ = 46253232.

The previous prime is 138759911. The next prime is 138759919. The reversal of 138759912 is 219957831.

It is not an unprimeable number, because it can be changed into a prime (138759911) 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, 320988 + ... + 321419.

It is an arithmetic number, because the mean of its divisors is an integer number (12045150).

Almost surely, 2^138759912 is an apocalyptic number.

138759912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138759912 is an abundant number, since it is smaller than the sum of its proper divisors (246684888).

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

138759912 is a wasteful number, since it uses less digits than its factorization.

138759912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642422 (or 642412 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 138759912 is about 11779.6397228438. The cubic root of 138759912 is about 517.7117302060.

The spelling of 138759912 in words is "one hundred thirty-eight million, seven hundred fifty-nine thousand, nine hundred twelve".