138990952 has 8 divisors (see below), whose sum is σ = 260608050. Its totient is φ = 69495472.

The previous prime is 138990937. The next prime is 138990983. The reversal of 138990952 is 259099831.

It can be written as a sum of positive squares in only one way, i.e., 88096996 + 50893956 = 9386^2 + 7134^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

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, 8686927 + ... + 8686942.

Almost surely, 2^138990952 is an apocalyptic number.

It is an amenable number.

138990952 is a deficient number, since it is larger than the sum of its proper divisors (121617098).

138990952 is a wasteful number, since it uses less digits than its factorization.

138990952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17373875 (or 17373871 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 138990952 is about 11789.4423956352. The cubic root of 138990952 is about 517.9989067920.

The spelling of 138990952 in words is "one hundred thirty-eight million, nine hundred ninety thousand, nine hundred fifty-two".