312309999 has 20 divisors (see below), whose sum is σ = 467200360. Its totient is φ = 207910800.

The previous prime is 312309983. The next prime is 312310051. The reversal of 312309999 is 999903213.

It is not a de Polignac number, because 312309999 - 2⁴ = 312309983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312309919) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 64824 + ... + 69474.

It is an arithmetic number, because the mean of its divisors is an integer number (23360018).

Almost surely, 2^312309999 is an apocalyptic number.

312309999 is a deficient number, since it is larger than the sum of its proper divisors (154890361).

312309999 is an equidigital number, since it uses as much as digits as its factorization.

312309999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5492 (or 5483 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 312309999 is about 17672.2946727356. The cubic root of 312309999 is about 678.4668450497.

The spelling of 312309999 in words is "three hundred twelve million, three hundred nine thousand, nine hundred ninety-nine".