312399 has 12 divisors (see below), whose sum is σ = 456976. Its totient is φ = 205632.

The previous prime is 312397. The next prime is 312401. The reversal of 312399 is 993213.

It is an interprime number because it is at equal distance from previous prime (312397) and next prime (312401).

It is not a de Polignac number, because 312399 - 2¹ = 312397 is a prime.

It is a Duffinian number.

312399 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 312399.

It is not an unprimeable number, because it can be changed into a prime (312397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 759 + ... + 1095.

2³¹²³⁹⁹ is an apocalyptic number.

312399 is a deficient number, since it is larger than the sum of its proper divisors (144577).

312399 is a wasteful number, since it uses less digits than its factorization.

312399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 443 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 312399 is about 558.9266499282. The cubic root of 312399 is about 67.8531287957.

The spelling of 312399 in words is "three hundred twelve thousand, three hundred ninety-nine".