317985 has 32 divisors (see below), whose sum is σ = 570240. Its totient is φ = 150528.

The previous prime is 317983. The next prime is 317987. The reversal of 317985 is 589713.

It is an interprime number because it is at equal distance from previous prime (317983) and next prime (317987).

It is not a de Polignac number, because 317985 - 2¹ = 317983 is a prime.

It is a super-2 number, since 2×317985² = 202228920450, which contains 22 as substring.

317985 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 317985.

It is not an unprimeable number, because it can be changed into a prime (317983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7374 + ... + 7416.

It is an arithmetic number, because the mean of its divisors is an integer number (17820).

2³¹⁷⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

317985 is a deficient number, since it is larger than the sum of its proper divisors (252255).

317985 is a wasteful number, since it uses less digits than its factorization.

317985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97.

The product of its digits is 7560, while the sum is 33.

The square root of 317985 is about 563.9015871586. The cubic root of 317985 is about 68.2551687373.

The spelling of 317985 in words is "three hundred seventeen thousand, nine hundred eighty-five".