138212872 has 32 divisors (see below), whose sum is σ = 298900800. Its totient is φ = 58688064.

The previous prime is 138212803. The next prime is 138212891. The reversal of 138212872 is 278212831.

138212872 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 5218 + ... + 17425.

It is an arithmetic number, because the mean of its divisors is an integer number (9340650).

Almost surely, 2^138212872 is an apocalyptic number.

It is an amenable number.

138212872 is an abundant number, since it is smaller than the sum of its proper divisors (160687928).

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

138212872 is a wasteful number, since it uses less digits than its factorization.

138212872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22765 (or 22761 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 138212872 is about 11756.3970671290. The cubic root of 138212872 is about 517.0305007652.

The spelling of 138212872 in words is "one hundred thirty-eight million, two hundred twelve thousand, eight hundred seventy-two".