393388138 has 32 divisors (see below), whose sum is σ = 703043712. Its totient is φ = 162724800.

The previous prime is 393388133. The next prime is 393388157. The reversal of 393388138 is 831883393.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (393388133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10620 + ... + 29992.

It is an arithmetic number, because the mean of its divisors is an integer number (21970116).

Almost surely, 2^393388138 is an apocalyptic number.

393388138 is a deficient number, since it is larger than the sum of its proper divisors (309655574).

393388138 is a wasteful number, since it uses less digits than its factorization.

393388138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19470.

The product of its digits is 373248, while the sum is 46.

The square root of 393388138 is about 19834.0146717703. The cubic root of 393388138 is about 732.7240054649.

The spelling of 393388138 in words is "three hundred ninety-three million, three hundred eighty-eight thousand, one hundred thirty-eight".