312986 has 4 divisors (see below), whose sum is σ = 469482. Its totient is φ = 156492.

The previous prime is 312979. The next prime is 312989. The reversal of 312986 is 689213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689213 = 7 ⋅98459.

It can be written as a sum of positive squares in only one way, i.e., 219961 + 93025 = 469^2 + 305^2 .

It is not an unprimeable number, because it can be changed into a prime (312989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78245 + ... + 78248.

2³¹²⁹⁸⁶ is an apocalyptic number.

312986 is a deficient number, since it is larger than the sum of its proper divisors (156496).

312986 is a wasteful number, since it uses less digits than its factorization.

312986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156495.

The product of its digits is 2592, while the sum is 29.

The square root of 312986 is about 559.4515171130. The cubic root of 312986 is about 67.8956010462.

The spelling of 312986 in words is "three hundred twelve thousand, nine hundred eighty-six".