138644732 has 12 divisors (see below), whose sum is σ = 242909856. Its totient is φ = 69241920.

The previous prime is 138644717. The next prime is 138644743. The reversal of 138644732 is 237446831.

It is a super-2 number, since 2×138644732² = 38444723422703648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16148 + ... + 23195.

It is an arithmetic number, because the mean of its divisors is an integer number (20242488).

Almost surely, 2^138644732 is an apocalyptic number.

It is an amenable number.

138644732 is a deficient number, since it is larger than the sum of its proper divisors (104265124).

138644732 is a wasteful number, since it uses less digits than its factorization.

138644732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40228 (or 40226 counting only the distinct ones).

The product of its digits is 96768, while the sum is 38.

The square root of 138644732 is about 11774.7497637954. The cubic root of 138644732 is about 517.5684454421.

The spelling of 138644732 in words is "one hundred thirty-eight million, six hundred forty-four thousand, seven hundred thirty-two".