138538812 has 12 divisors (see below), whose sum is σ = 323257256. Its totient is φ = 46179600.

The previous prime is 138538801. The next prime is 138538853. The reversal of 138538812 is 218835831.

138538812 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 (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5772439 + ... + 5772462.

Almost surely, 2^138538812 is an apocalyptic number.

138538812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138538812 is an abundant number, since it is smaller than the sum of its proper divisors (184718444).

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

138538812 is a wasteful number, since it uses less digits than its factorization.

138538812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11544908 (or 11544906 counting only the distinct ones).

The product of its digits is 46080, while the sum is 39.

The square root of 138538812 is about 11770.2511443044. The cubic root of 138538812 is about 517.4366101263.

The spelling of 138538812 in words is "one hundred thirty-eight million, five hundred thirty-eight thousand, eight hundred twelve".