393928256 has 14 divisors (see below), whose sum is σ = 781701510. Its totient is φ = 196964096.

The previous prime is 393928217. The next prime is 393928259. The reversal of 393928256 is 652829393.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 392673856 + 1254400 = 19816^2 + 1120^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 393928256.

It is not an unprimeable number, because it can be changed into a prime (393928259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3077501 + ... + 3077628.

Almost surely, 2^393928256 is an apocalyptic number.

It is an amenable number.

393928256 is a deficient number, since it is larger than the sum of its proper divisors (387773254).

393928256 is an equidigital number, since it uses as much as digits as its factorization.

393928256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6155141 (or 6155131 counting only the distinct ones).

The product of its digits is 699840, while the sum is 47.

The square root of 393928256 is about 19847.6259537507. The cubic root of 393928256 is about 733.0591930320.

The spelling of 393928256 in words is "three hundred ninety-three million, nine hundred twenty-eight thousand, two hundred fifty-six".