138897624 has 32 divisors (see below), whose sum is σ = 350688240. Its totient is φ = 45840000.

The previous prime is 138897589. The next prime is 138897637. The reversal of 138897624 is 426798831.

It is a congruent number.

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, 26227 + ... + 31074.

Almost surely, 2^138897624 is an apocalyptic number.

It is an amenable number.

138897624 is an abundant number, since it is smaller than the sum of its proper divisors (211790616).

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

138897624 is a wasteful number, since it uses less digits than its factorization.

138897624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57411 (or 57407 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 138897624 is about 11785.4836133270. The cubic root of 138897624 is about 517.8829409065.

The spelling of 138897624 in words is "one hundred thirty-eight million, eight hundred ninety-seven thousand, six hundred twenty-four".