138890972 has 12 divisors (see below), whose sum is σ = 265155576. Its totient is φ = 63132240.

The previous prime is 138890971. The next prime is 138890977. The reversal of 138890972 is 279098831.

138890972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138890971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1578263 + ... + 1578350.

It is an arithmetic number, because the mean of its divisors is an integer number (22096298).

Almost surely, 2^138890972 is an apocalyptic number.

It is an amenable number.

138890972 is a deficient number, since it is larger than the sum of its proper divisors (126264604).

138890972 is a wasteful number, since it uses less digits than its factorization.

138890972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3156628 (or 3156626 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 138890972 is about 11785.2013983640. The cubic root of 138890972 is about 517.8746733969.

The spelling of 138890972 in words is "one hundred thirty-eight million, eight hundred ninety thousand, nine hundred seventy-two".