138535972 has 6 divisors (see below), whose sum is σ = 242437958. Its totient is φ = 69267984.

The previous prime is 138535963. The next prime is 138535997. The reversal of 138535972 is 279535831.

138535972 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 138156516 + 379456 = 11754^2 + 616^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17316993 + ... + 17317000.

Almost surely, 2^138535972 is an apocalyptic number.

It is an amenable number.

138535972 is a deficient number, since it is larger than the sum of its proper divisors (103901986).

138535972 is a wasteful number, since it uses less digits than its factorization.

138535972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34633997 (or 34633995 counting only the distinct ones).

The product of its digits is 226800, while the sum is 43.

The square root of 138535972 is about 11770.1305005510. The cubic root of 138535972 is about 517.4330743421.

The spelling of 138535972 in words is "one hundred thirty-eight million, five hundred thirty-five thousand, nine hundred seventy-two".