138231396 has 36 divisors (see below), whose sum is σ = 349916112. Its totient is φ = 46011504.

The previous prime is 138231349. The next prime is 138231397. The reversal of 138231396 is 693132831.

138231396 is a `hidden beast` number, since 1 + 38 + 231 + 396 = 666.

138231396 is digitally balanced in base 2 and base 3, because in such bases 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 (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 138231396.

It is not an unprimeable number, because it can be changed into a prime (138231397) 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, 27451 + ... + 32093.

It is an arithmetic number, because the mean of its divisors is an integer number (9719892).

Almost surely, 2^138231396 is an apocalyptic number.

It is an amenable number.

138231396 is an abundant number, since it is smaller than the sum of its proper divisors (211684716).

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

138231396 is a wasteful number, since it uses less digits than its factorization.

138231396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5480 (or 5475 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 138231396 is about 11757.1848671355. The cubic root of 138231396 is about 517.0535980957.

The spelling of 138231396 in words is "one hundred thirty-eight million, two hundred thirty-one thousand, three hundred ninety-six".