393123728 has 20 divisors (see below), whose sum is σ = 794794368. Its totient is φ = 188015520.

The previous prime is 393123713. The next prime is 393123767. The reversal of 393123728 is 827321393.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 393123691 and 393123700.

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, 533768 + ... + 534503.

Almost surely, 2^393123728 is an apocalyptic number.

It is an amenable number.

393123728 is an abundant number, since it is smaller than the sum of its proper divisors (401670640).

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

393123728 is a wasteful number, since it uses less digits than its factorization.

393123728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068302 (or 1068296 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The square root of 393123728 is about 19827.3479820172. The cubic root of 393123728 is about 732.5598054817.

The spelling of 393123728 in words is "three hundred ninety-three million, one hundred twenty-three thousand, seven hundred twenty-eight".