138188412 has 36 divisors (see below), whose sum is σ = 357437080. Its totient is φ = 44991072.

The previous prime is 138188389. The next prime is 138188429. The reversal of 138188412 is 214881831.

138188412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 517³-1.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×138188412² = 38192074422163488, which contains 22 as substring.

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

It is a congruent number.

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, 43087 + ... + 46182.

Almost surely, 2^138188412 is an apocalyptic number.

138188412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138188412 is an abundant number, since it is smaller than the sum of its proper divisors (219248668).

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

138188412 is a wasteful number, since it uses less digits than its factorization.

138188412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89322 (or 89317 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 138188412 is about 11755.3567363989. The cubic root of 138188412 is about 516.9999987529. Note that the first 5 decimals are identical.

The spelling of 138188412 in words is "one hundred thirty-eight million, one hundred eighty-eight thousand, four hundred twelve".