138268388 has 12 divisors (see below), whose sum is σ = 246071280. Its totient is φ = 67962312.

The previous prime is 138268379. The next prime is 138268391. The reversal of 138268388 is 883862831.

138268388 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 3 ways as a sum of consecutive naturals, for example, 292706 + ... + 293177.

It is an arithmetic number, because the mean of its divisors is an integer number (20505940).

Almost surely, 2^138268388 is an apocalyptic number.

It is an amenable number.

138268388 is a deficient number, since it is larger than the sum of its proper divisors (107802892).

138268388 is a wasteful number, since it uses less digits than its factorization.

138268388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585946 (or 585944 counting only the distinct ones).

The product of its digits is 442368, while the sum is 47.

The square root of 138268388 is about 11758.7579276044. The cubic root of 138268388 is about 517.0997167570.

The spelling of 138268388 in words is "one hundred thirty-eight million, two hundred sixty-eight thousand, three hundred eighty-eight".