312985 has 4 divisors (see below), whose sum is σ = 375588. Its totient is φ = 250384.

The previous prime is 312979. The next prime is 312989. The reversal of 312985 is 589213.

312985 is nontrivially palindromic in base 13.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 163216 + 149769 = 404^2 + 387^2 .

It is a cyclic number.

It is not a de Polignac number, because 312985 - 2⁷ = 312857 is a prime.

It is a super-2 number, since 2×312985² = 195919220450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31294 + ... + 31303.

It is an arithmetic number, because the mean of its divisors is an integer number (93897).

2³¹²⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

312985 is a deficient number, since it is larger than the sum of its proper divisors (62603).

312985 is an equidigital number, since it uses as much as digits as its factorization.

312985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62602.

The product of its digits is 2160, while the sum is 28.

The square root of 312985 is about 559.4506233798. The cubic root of 312985 is about 67.8955287366.

The spelling of 312985 in words is "three hundred twelve thousand, nine hundred eighty-five".