138445572 has 24 divisors (see below), whose sum is σ = 323267392. Its totient is φ = 46116000.

The previous prime is 138445553. The next prime is 138445591. The reversal of 138445572 is 275544831.

It is an interprime number because it is at equal distance from previous prime (138445553) and next prime (138445591).

It is a self number, because there is not a number n which added to its sum of digits gives 138445572.

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, 18822 + ... + 25122.

Almost surely, 2^138445572 is an apocalyptic number.

138445572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138445572 is an abundant number, since it is smaller than the sum of its proper divisors (184821820).

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

138445572 is a wasteful number, since it uses less digits than its factorization.

138445572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8139 (or 8137 counting only the distinct ones).

The product of its digits is 134400, while the sum is 39.

The square root of 138445572 is about 11766.2896445736. The cubic root of 138445572 is about 517.3205015874.

The spelling of 138445572 in words is "one hundred thirty-eight million, four hundred forty-five thousand, five hundred seventy-two".