138917752 has 16 divisors (see below), whose sum is σ = 261488160. Its totient is φ = 69187584.

The previous prime is 138917749. The next prime is 138917767. The reversal of 138917752 is 257719831.

It is a junction number, because it is equal to n+sod(n) for n = 138917699 and 138917708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31728 + ... + 35839.

It is an arithmetic number, because the mean of its divisors is an integer number (16343010).

Almost surely, 2^138917752 is an apocalyptic number.

It is an amenable number.

138917752 is a deficient number, since it is larger than the sum of its proper divisors (122570408).

138917752 is a wasteful number, since it uses less digits than its factorization.

138917752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67830 (or 67826 counting only the distinct ones).

The product of its digits is 105840, while the sum is 43.

The square root of 138917752 is about 11786.3375142578. The cubic root of 138917752 is about 517.9079555997.

The spelling of 138917752 in words is "one hundred thirty-eight million, nine hundred seventeen thousand, seven hundred fifty-two".