138408012 has 18 divisors (see below), whose sum is σ = 349864788. Its totient is φ = 46135992.

The previous prime is 138407993. The next prime is 138408047. The reversal of 138408012 is 210804831.

138408012 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 an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1922298 + ... + 1922369.

Almost surely, 2^138408012 is an apocalyptic number.

138408012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138408012 is an abundant number, since it is smaller than the sum of its proper divisors (211456776).

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

138408012 is a wasteful number, since it uses less digits than its factorization.

138408012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3844677 (or 3844672 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 138408012 is about 11764.6934511699. The cubic root of 138408012 is about 517.2737146921.

The spelling of 138408012 in words is "one hundred thirty-eight million, four hundred eight thousand, twelve".