312988 has 18 divisors (see below), whose sum is σ = 594384.
Its totient is φ = 144144.
The previous prime is 312979. The next prime is 312989. The reversal of 312988 is 889213.
It is a super-2 number, since 2×3129882 = 195922976288, which contains 22 as substring.
It is a congruent number.
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 in 5 ways as a sum of consecutive naturals, for example, 445 + ... + 907.
2312988 is an apocalyptic number.
It is an amenable number.
312988 is a deficient number, since it is larger than the sum of its proper divisors (281396).
312988 is a wasteful number, since it uses less digits than its factorization.
312988 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 493 (or 478 counting only the distinct ones).
The product of its digits is 3456, while the sum is 31.
The square root of 312988 is about 559.4533045751.
The cubic root of 312988 is about 67.8957456649.
The spelling of 312988 in words is "three hundred twelve thousand, nine hundred eighty-eight".