138465572 has 36 divisors (see below), whose sum is σ = 287892864. Its totient is φ = 58075920.

The previous prime is 138465557. The next prime is 138465583. The reversal of 138465572 is 275564831.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1697 + ... + 16727.

It is an arithmetic number, because the mean of its divisors is an integer number (7997024).

Almost surely, 2^138465572 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 138465572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143946432).

138465572 is an abundant number, since it is smaller than the sum of its proper divisors (149427292).

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

138465572 is a wasteful number, since it uses less digits than its factorization.

138465572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15096 (or 15087 counting only the distinct ones).

The product of its digits is 201600, while the sum is 41.

The square root of 138465572 is about 11767.1394994705. The cubic root of 138465572 is about 517.3454112847.

The spelling of 138465572 in words is "one hundred thirty-eight million, four hundred sixty-five thousand, five hundred seventy-two".