138709932 has 24 divisors (see below), whose sum is σ = 327558336. Its totient is φ = 45679248.

The previous prime is 138709877. The next prime is 138709933. The reversal of 138709932 is 239907831.

It is not an unprimeable number, because it can be changed into a prime (138709933) 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, 68638 + ... + 70629.

It is an arithmetic number, because the mean of its divisors is an integer number (13648264).

Almost surely, 2^138709932 is an apocalyptic number.

138709932 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138709932 is an abundant number, since it is smaller than the sum of its proper divisors (188848404).

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

138709932 is a wasteful number, since it uses less digits than its factorization.

138709932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139357 (or 139355 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 138709932 is about 11777.5180747049. The cubic root of 138709932 is about 517.6495644618.

The spelling of 138709932 in words is "one hundred thirty-eight million, seven hundred nine thousand, nine hundred thirty-two".