138736408 has 16 divisors (see below), whose sum is σ = 268522560. Its totient is φ = 67130400.

The previous prime is 138736373. The next prime is 138736417. The reversal of 138736408 is 804637831.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 279463 + ... + 279958.

It is an arithmetic number, because the mean of its divisors is an integer number (16782660).

Almost surely, 2^138736408 is an apocalyptic number.

It is an amenable number.

138736408 is a deficient number, since it is larger than the sum of its proper divisors (129786152).

138736408 is a wasteful number, since it uses less digits than its factorization.

138736408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559458 (or 559454 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 138736408 is about 11778.6420269911. The cubic root of 138736408 is about 517.6824974988.

The spelling of 138736408 in words is "one hundred thirty-eight million, seven hundred thirty-six thousand, four hundred eight".