138363956 has 6 divisors (see below), whose sum is σ = 242136930. Its totient is φ = 69181976.

The previous prime is 138363937. The next prime is 138363961. The reversal of 138363956 is 659363831.

It can be written as a sum of positive squares in only one way, i.e., 116424100 + 21939856 = 10790^2 + 4684^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17295491 + ... + 17295498.

It is an arithmetic number, because the mean of its divisors is an integer number (40356155).

Almost surely, 2^138363956 is an apocalyptic number.

It is an amenable number.

138363956 is a deficient number, since it is larger than the sum of its proper divisors (103772974).

138363956 is a wasteful number, since it uses less digits than its factorization.

138363956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34590993 (or 34590991 counting only the distinct ones).

The product of its digits is 349920, while the sum is 44.

The square root of 138363956 is about 11762.8209201705. The cubic root of 138363956 is about 517.2188252175.

The spelling of 138363956 in words is "one hundred thirty-eight million, three hundred sixty-three thousand, nine hundred fifty-six".