138995888 has 20 divisors (see below), whose sum is σ = 269536320. Its totient is φ = 69438144.

The previous prime is 138995833. The next prime is 138995891. The reversal of 138995888 is 888599831.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20006 + ... + 26042.

It is an arithmetic number, because the mean of its divisors is an integer number (13476816).

Almost surely, 2^138995888 is an apocalyptic number.

It is an amenable number.

138995888 is a deficient number, since it is larger than the sum of its proper divisors (130540432).

138995888 is a wasteful number, since it uses less digits than its factorization.

138995888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7484 (or 7478 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 59.

The square root of 138995888 is about 11789.6517336179. The cubic root of 138995888 is about 518.0050386356.

The spelling of 138995888 in words is "one hundred thirty-eight million, nine hundred ninety-five thousand, eight hundred eighty-eight".