393994764 has 18 divisors (see below), whose sum is σ = 995931300. Its totient is φ = 131331576.

The previous prime is 393994763. The next prime is 393994793. The reversal of 393994764 is 467499393.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 393994764.

It is not an unprimeable number, because it can be changed into a prime (393994763) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5472114 + ... + 5472185.

Almost surely, 2^393994764 is an apocalyptic number.

It is an amenable number.

393994764 is an abundant number, since it is smaller than the sum of its proper divisors (601936536).

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

393994764 is a wasteful number, since it uses less digits than its factorization.

393994764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10944309 (or 10944304 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 54.

The square root of 393994764 is about 19849.3013479064. The cubic root of 393994764 is about 733.1004455160.

The spelling of 393994764 in words is "three hundred ninety-three million, nine hundred ninety-four thousand, seven hundred sixty-four".