138632908 has 24 divisors (see below), whose sum is σ = 246818880. Its totient is φ = 68122320.

The previous prime is 138632887. The next prime is 138632917. The reversal of 138632908 is 809236831.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69063 + ... + 71041.

It is an arithmetic number, because the mean of its divisors is an integer number (10284120).

Almost surely, 2^138632908 is an apocalyptic number.

It is an amenable number.

138632908 is a deficient number, since it is larger than the sum of its proper divisors (108185972).

138632908 is a wasteful number, since it uses less digits than its factorization.

138632908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277 (or 2275 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 138632908 is about 11774.2476617404. The cubic root of 138632908 is about 517.5537318087.

The spelling of 138632908 in words is "one hundred thirty-eight million, six hundred thirty-two thousand, nine hundred eight".