312489 has 6 divisors (see below), whose sum is σ = 451386. Its totient is φ = 208320.

The previous prime is 312469. The next prime is 312509. The reversal of 312489 is 984213.

It is an interprime number because it is at equal distance from previous prime (312469) and next prime (312509).

It can be written as a sum of positive squares in only one way, i.e., 275625 + 36864 = 525^2 + 192^2 .

It is not a de Polignac number, because 312489 - 2⁸ = 312233 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312469) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17352 + ... + 17369.

It is an arithmetic number, because the mean of its divisors is an integer number (75231).

2³¹²⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

312489 is a deficient number, since it is larger than the sum of its proper divisors (138897).

312489 is a wasteful number, since it uses less digits than its factorization.

312489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34727 (or 34724 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 312489 is about 559.0071555893. The cubic root of 312489 is about 67.8596441764.

The spelling of 312489 in words is "three hundred twelve thousand, four hundred eighty-nine".