138597872 has 60 divisors (see below), whose sum is σ = 330782400. Its totient is φ = 55899648.

The previous prime is 138597871. The next prime is 138597881. The reversal of 138597872 is 278795831.

It is a self number, because there is not a number n which added to its sum of digits gives 138597872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138597871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8129 + ... + 18527.

It is an arithmetic number, because the mean of its divisors is an integer number (5513040).

Almost surely, 2^138597872 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 138597872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165391200).

138597872 is an abundant number, since it is smaller than the sum of its proper divisors (192184528).

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

138597872 is a wasteful number, since it uses less digits than its factorization.

138597872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10438 (or 10425 counting only the distinct ones).

The product of its digits is 846720, while the sum is 50.

The square root of 138597872 is about 11772.7597444270. The cubic root of 138597872 is about 517.5101285484.

The spelling of 138597872 in words is "one hundred thirty-eight million, five hundred ninety-seven thousand, eight hundred seventy-two".