257982217 has 8 divisors (see below), whose sum is σ = 271330560. Its totient is φ = 244948080.

The previous prime is 257982203. The next prime is 257982229. The reversal of 257982217 is 712289752.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257982217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257982287) 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, 76867 + ... + 80152.

It is an arithmetic number, because the mean of its divisors is an integer number (33916320).

Almost surely, 2^257982217 is an apocalyptic number.

It is an amenable number.

257982217 is a deficient number, since it is larger than the sum of its proper divisors (13348343).

257982217 is a wasteful number, since it uses less digits than its factorization.

257982217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157103.

The product of its digits is 141120, while the sum is 43.

The square root of 257982217 is about 16061.8248340592. The cubic root of 257982217 is about 636.5950493104.

The spelling of 257982217 in words is "two hundred fifty-seven million, nine hundred eighty-two thousand, two hundred seventeen".