138940372 has 6 divisors (see below), whose sum is σ = 243145658. Its totient is φ = 69470184.

The previous prime is 138940343. The next prime is 138940391. The reversal of 138940372 is 273049831.

It can be written as a sum of positive squares in only one way, i.e., 92236816 + 46703556 = 9604^2 + 6834^2 .

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 as a sum of consecutive naturals, namely, 17367543 + ... + 17367550.

Almost surely, 2^138940372 is an apocalyptic number.

It is an amenable number.

138940372 is a deficient number, since it is larger than the sum of its proper divisors (104205286).

138940372 is a wasteful number, since it uses less digits than its factorization.

138940372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34735097 (or 34735095 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 138940372 is about 11787.2970608193. The cubic root of 138940372 is about 517.9360644195.

The spelling of 138940372 in words is "one hundred thirty-eight million, nine hundred forty thousand, three hundred seventy-two".