394395657 has 8 divisors (see below), whose sum is σ = 525955584. Its totient is φ = 262883088.

The previous prime is 394395643. The next prime is 394395719. The reversal of 394395657 is 756593493.

It is a happy number.

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

It is not a de Polignac number, because 394395657 - 2⁴ = 394395641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (394395457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19288 + ... + 34070.

It is an arithmetic number, because the mean of its divisors is an integer number (65744448).

Almost surely, 2^394395657 is an apocalyptic number.

It is an amenable number.

394395657 is a deficient number, since it is larger than the sum of its proper divisors (131559927).

394395657 is a wasteful number, since it uses less digits than its factorization.

394395657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23679.

The product of its digits is 3061800, while the sum is 51.

The square root of 394395657 is about 19859.3971962897. The cubic root of 394395657 is about 733.3490065291.

The spelling of 394395657 in words is "three hundred ninety-four million, three hundred ninety-five thousand, six hundred fifty-seven".