138568572 has 18 divisors (see below), whose sum is σ = 350270648. Its totient is φ = 46189512.

The previous prime is 138568571. The next prime is 138568579. The reversal of 138568572 is 275865831.

138568572 is a `hidden beast` number, since 1 + 38 + 568 + 57 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×138568572² = 38402498292238368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138568571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1924528 + ... + 1924599.

Almost surely, 2^138568572 is an apocalyptic number.

138568572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138568572 is an abundant number, since it is smaller than the sum of its proper divisors (211702076).

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

138568572 is a wasteful number, since it uses less digits than its factorization.

138568572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3849137 (or 3849132 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 138568572 is about 11771.5152805406. The cubic root of 138568572 is about 517.4736582545.

The spelling of 138568572 in words is "one hundred thirty-eight million, five hundred sixty-eight thousand, five hundred seventy-two".