312389 has 8 divisors (see below), whose sum is σ = 389568. Its totient is φ = 243360.

The previous prime is 312383. The next prime is 312397. The reversal of 312389 is 983213.

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

It is a cyclic number.

It is not a de Polignac number, because 312389 - 2¹² = 308293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1952 + ... + 2105.

It is an arithmetic number, because the mean of its divisors is an integer number (48696).

2³¹²³⁸⁹ is an apocalyptic number.

It is an amenable number.

312389 is a deficient number, since it is larger than the sum of its proper divisors (77179).

312389 is a wasteful number, since it uses less digits than its factorization.

312389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4075.

The product of its digits is 1296, while the sum is 26.

The square root of 312389 is about 558.9177041390. The cubic root of 312389 is about 67.8524047872.

The spelling of 312389 in words is "three hundred twelve thousand, three hundred eighty-nine".