138644544 has 56 divisors (see below), whose sum is σ = 368064288. Its totient is φ = 46059520.

The previous prime is 138644533. The next prime is 138644551. The reversal of 138644544 is 445446831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65584 + ... + 67664.

Almost surely, 2^138644544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138644544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184032144).

138644544 is an abundant number, since it is smaller than the sum of its proper divisors (229419744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138644544 is a wasteful number, since it uses less digits than its factorization.

138644544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443 (or 2433 counting only the distinct ones).

The product of its digits is 184320, while the sum is 39.

The square root of 138644544 is about 11774.7417806082. The cubic root of 138644544 is about 517.5682115039.

The spelling of 138644544 in words is "one hundred thirty-eight million, six hundred forty-four thousand, five hundred forty-four".