138993896 has 8 divisors (see below), whose sum is σ = 260613570. Its totient is φ = 69496944.

The previous prime is 138993889. The next prime is 138993901. The reversal of 138993896 is 698399831.

It can be written as a sum of positive squares in only one way, i.e., 138909796 + 84100 = 11786^2 + 290^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8687111 + ... + 8687126.

Almost surely, 2^138993896 is an apocalyptic number.

It is an amenable number.

138993896 is a deficient number, since it is larger than the sum of its proper divisors (121619674).

138993896 is a wasteful number, since it uses less digits than its factorization.

138993896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17374243 (or 17374239 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 56.

The square root of 138993896 is about 11789.5672524482. The cubic root of 138993896 is about 518.0025640516.

The spelling of 138993896 in words is "one hundred thirty-eight million, nine hundred ninety-three thousand, eight hundred ninety-six".