138228912 has 60 divisors (see below), whose sum is σ = 387960040. Its totient is φ = 45944064.

The previous prime is 138228911. The next prime is 138228943. The reversal of 138228912 is 219822831.

It is a super-2 number, since 2×138228912² = 38214464225407488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (138228911) 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, 57723 + ... + 60069.

Almost surely, 2^138228912 is an apocalyptic number.

138228912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138228912 is an abundant number, since it is smaller than the sum of its proper divisors (249731128).

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

138228912 is a wasteful number, since it uses less digits than its factorization.

138228912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2770 (or 2761 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 138228912 is about 11757.0792291283. The cubic root of 138228912 is about 517.0505009488.

The spelling of 138228912 in words is "one hundred thirty-eight million, two hundred twenty-eight thousand, nine hundred twelve".