394636664 has 8 divisors (see below), whose sum is σ = 739943760. Its totient is φ = 197318328.

The previous prime is 394636621. The next prime is 394636699. The reversal of 394636664 is 466636493.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24664784 + ... + 24664799.

It is an arithmetic number, because the mean of its divisors is an integer number (92492970).

Almost surely, 2^394636664 is an apocalyptic number.

It is an amenable number.

394636664 is a deficient number, since it is larger than the sum of its proper divisors (345307096).

394636664 is a wasteful number, since it uses less digits than its factorization.

394636664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49329589 (or 49329585 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 47.

The square root of 394636664 is about 19865.4641023058. The cubic root of 394636664 is about 733.4983542310.

The spelling of 394636664 in words is "three hundred ninety-four million, six hundred thirty-six thousand, six hundred sixty-four".