394009057 has 16 divisors (see below), whose sum is σ = 437281488. Its totient is φ = 352696320.

The previous prime is 394009027. The next prime is 394009079. The reversal of 394009057 is 750900493.

It can be written as a sum of positive squares in 8 ways, for example, as 47900241 + 346108816 = 6921^2 + 18604^2 .

It is a cyclic number.

It is not a de Polignac number, because 394009057 - 2²³ = 385620449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394009027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90073 + ... + 94345.

It is an arithmetic number, because the mean of its divisors is an integer number (27330093).

Almost surely, 2^394009057 is an apocalyptic number.

It is an amenable number.

394009057 is a deficient number, since it is larger than the sum of its proper divisors (43272431).

394009057 is a wasteful number, since it uses less digits than its factorization.

394009057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 394009057 is about 19849.6613825022. The cubic root of 394009057 is about 733.1093103360.

The spelling of 394009057 in words is "three hundred ninety-four million, nine thousand, fifty-seven".