138991176 has 24 divisors (see below), whose sum is σ = 376434630. Its totient is φ = 46330368.

The previous prime is 138991163. The next prime is 138991199. The reversal of 138991176 is 671199831.

It can be written as a sum of positive squares in only one way, i.e., 136188900 + 2802276 = 11670^2 + 1674^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 965145 + ... + 965288.

Almost surely, 2^138991176 is an apocalyptic number.

It is an amenable number.

138991176 is an abundant number, since it is smaller than the sum of its proper divisors (237443454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138991176 is a wasteful number, since it uses less digits than its factorization.

138991176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930445 (or 1930438 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 138991176 is about 11789.4518956566. The cubic root of 138991176 is about 517.9991850635. Note that the first 3 decimals are identical.

The spelling of 138991176 in words is "one hundred thirty-eight million, nine hundred ninety-one thousand, one hundred seventy-six".