394333728 has 24 divisors (see below), whose sum is σ = 1035126288. Its totient is φ = 131444544.

The previous prime is 394333721. The next prime is 394333729. The reversal of 394333728 is 827333493.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 394333728.

It is not an unprimeable number, because it can be changed into a prime (394333721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2053726 + ... + 2053917.

It is an arithmetic number, because the mean of its divisors is an integer number (43130262).

Almost surely, 2^394333728 is an apocalyptic number.

It is an amenable number.

394333728 is an abundant number, since it is smaller than the sum of its proper divisors (640792560).

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

394333728 is a wasteful number, since it uses less digits than its factorization.

394333728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4107656 (or 4107648 counting only the distinct ones).

The product of its digits is 326592, while the sum is 42.

The square root of 394333728 is about 19857.8379487798. The cubic root of 394333728 is about 733.3106204168.

The spelling of 394333728 in words is "three hundred ninety-four million, three hundred thirty-three thousand, seven hundred twenty-eight".