138648932 has 18 divisors (see below), whose sum is σ = 244893558. Its totient is φ = 68681632.

The previous prime is 138648893. The next prime is 138648943. The reversal of 138648932 is 239846831.

It can be written as a sum of positive squares in only one way, i.e., 122456356 + 16192576 = 11066^2 + 4024^2 .

It is a congruent number.

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, 275393 + ... + 275895.

Almost surely, 2^138648932 is an apocalyptic number.

It is an amenable number.

138648932 is a deficient number, since it is larger than the sum of its proper divisors (106244626).

138648932 is an equidigital number, since it uses as much as digits as its factorization.

138648932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147 (or 642 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 138648932 is about 11774.9281101839. The cubic root of 138648932 is about 517.5736716667.

The spelling of 138648932 in words is "one hundred thirty-eight million, six hundred forty-eight thousand, nine hundred thirty-two".