312669 has 18 divisors (see below), whose sum is σ = 526110. Its totient is φ = 178416.

The previous prime is 312643. The next prime is 312673. The reversal of 312669 is 966213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 213444 + 99225 = 462^2 + 315^2 .

It is not a de Polignac number, because 312669 - 2⁸ = 312413 is a prime.

It is a super-2 number, since 2×312669² = 195523807122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312619) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 87 + ... + 795.

2³¹²⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

312669 is a deficient number, since it is larger than the sum of its proper divisors (213441).

312669 is a wasteful number, since it uses less digits than its factorization.

312669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729 (or 719 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 312669 is about 559.1681321392. The cubic root of 312669 is about 67.8726711857.

The spelling of 312669 in words is "three hundred twelve thousand, six hundred sixty-nine".