138928572 has 18 divisors (see below), whose sum is σ = 351180648. Its totient is φ = 46309512.

The previous prime is 138928567. The next prime is 138928583. The reversal of 138928572 is 275829831.

It is a happy number.

138928572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×138928572² = 38602296235918368, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1929528 + ... + 1929599.

It is an arithmetic number, because the mean of its divisors is an integer number (19510036).

Almost surely, 2^138928572 is an apocalyptic number.

138928572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138928572 is an abundant number, since it is smaller than the sum of its proper divisors (212252076).

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

138928572 is a wasteful number, since it uses less digits than its factorization.

138928572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3859137 (or 3859132 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 138928572 is about 11786.7965113512. The cubic root of 138928572 is about 517.9214014901.

The spelling of 138928572 in words is "one hundred thirty-eight million, nine hundred twenty-eight thousand, five hundred seventy-two".