138926972 has 12 divisors (see below), whose sum is σ = 244185480. Its totient is φ = 69159696.

The previous prime is 138926959. The next prime is 138926987. The reversal of 138926972 is 279629831.

It is a happy number.

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, 74918 + ... + 76749.

It is an arithmetic number, because the mean of its divisors is an integer number (20348790).

Almost surely, 2^138926972 is an apocalyptic number.

It is an amenable number.

138926972 is a deficient number, since it is larger than the sum of its proper divisors (105258508).

138926972 is a wasteful number, since it uses less digits than its factorization.

138926972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151900 (or 151898 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 138926972 is about 11786.7286386003. The cubic root of 138926972 is about 517.9194132324.

The spelling of 138926972 in words is "one hundred thirty-eight million, nine hundred twenty-six thousand, nine hundred seventy-two".