394331666 has 8 divisors (see below), whose sum is σ = 591598080. Its totient is φ = 197132308.

The previous prime is 394331653. The next prime is 394331669. The reversal of 394331666 is 666133493.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (394331669) 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, 2255 + ... + 28173.

It is an arithmetic number, because the mean of its divisors is an integer number (73949760).

Almost surely, 2^394331666 is an apocalyptic number.

394331666 is a deficient number, since it is larger than the sum of its proper divisors (197266414).

394331666 is a wasteful number, since it uses less digits than its factorization.

394331666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33528.

The product of its digits is 209952, while the sum is 41.

The square root of 394331666 is about 19857.7860296660. The cubic root of 394331666 is about 733.3093422363.

The spelling of 394331666 in words is "three hundred ninety-four million, three hundred thirty-one thousand, six hundred sixty-six".