312889 has 4 divisors (see below), whose sum is σ = 315280. Its totient is φ = 310500.

The previous prime is 312887. The next prime is 312899. The reversal of 312889 is 988213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 312889 - 2¹ = 312887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312889.

It is not an unprimeable number, because it can be changed into a prime (312887) 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, 987 + ... + 1264.

It is an arithmetic number, because the mean of its divisors is an integer number (78820).

2³¹²⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

312889 is a deficient number, since it is larger than the sum of its proper divisors (2391).

312889 is a wasteful number, since it uses less digits than its factorization.

312889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390.

The product of its digits is 3456, while the sum is 31.

The square root of 312889 is about 559.3648183431. The cubic root of 312889 is about 67.8885862982. Note that the first 3 decimals are identical.

The spelling of 312889 in words is "three hundred twelve thousand, eight hundred eighty-nine".