394257 has 8 divisors (see below), whose sum is σ = 530784. Its totient is φ = 260288.

The previous prime is 394249. The next prime is 394259. The reversal of 394257 is 752493.

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

It is a cyclic number.

It is not a de Polignac number, because 394257 - 2³ = 394249 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 394257.

It is not an unprimeable number, because it can be changed into a prime (394259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243 + ... + 920.

It is an arithmetic number, because the mean of its divisors is an integer number (66348).

2³⁹⁴²⁵⁷ is an apocalyptic number.

It is an amenable number.

394257 is a deficient number, since it is larger than the sum of its proper divisors (136527).

394257 is a wasteful number, since it uses less digits than its factorization.

394257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279.

The product of its digits is 7560, while the sum is 30.

The square root of 394257 is about 627.8988772087. The cubic root of 394257 is about 73.3263055708.

The spelling of 394257 in words is "three hundred ninety-four thousand, two hundred fifty-seven".