395257317 has 32 divisors (see below), whose sum is σ = 649813248. Its totient is φ = 208106496.

The previous prime is 395257309. The next prime is 395257319. The reversal of 395257317 is 713752593.

It is not a de Polignac number, because 395257317 - 2³ = 395257309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (395257319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210093 + ... + 211965.

It is an arithmetic number, because the mean of its divisors is an integer number (20306664).

Almost surely, 2^395257317 is an apocalyptic number.

395257317 is the 16233-rd pentagonal number.

It is an amenable number.

395257317 is a deficient number, since it is larger than the sum of its proper divisors (254555931).

395257317 is a wasteful number, since it uses less digits than its factorization.

395257317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669.

The product of its digits is 198450, while the sum is 42.

The square root of 395257317 is about 19881.0793721065. The cubic root of 395257317 is about 733.8826820146.

The spelling of 395257317 in words is "three hundred ninety-five million, two hundred fifty-seven thousand, three hundred seventeen".