138213896 has 8 divisors (see below), whose sum is σ = 259151070. Its totient is φ = 69106944.

The previous prime is 138213883. The next prime is 138213937. The reversal of 138213896 is 698312831.

It can be written as a sum of positive squares in only one way, i.e., 86229796 + 51984100 = 9286^2 + 7210^2 .

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, 8638361 + ... + 8638376.

Almost surely, 2^138213896 is an apocalyptic number.

It is an amenable number.

138213896 is a deficient number, since it is larger than the sum of its proper divisors (120937174).

138213896 is a wasteful number, since it uses less digits than its factorization.

138213896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17276743 (or 17276739 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 138213896 is about 11756.4406178061. The cubic root of 138213896 is about 517.0317776311.

The spelling of 138213896 in words is "one hundred thirty-eight million, two hundred thirteen thousand, eight hundred ninety-six".