312399999 has 6 divisors (see below), whose sum is σ = 451244456. Its totient is φ = 208266660.

The previous prime is 312399937. The next prime is 312400001. The reversal of 312399999 is 999993213.

It is not a de Polignac number, because 312399999 - 2⁸ = 312399743 is a prime.

It is a Duffinian number.

312399999 is a modest number, since divided by 99999 gives 3123 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312392999) 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, 17355547 + ... + 17355564.

Almost surely, 2^312399999 is an apocalyptic number.

312399999 is a deficient number, since it is larger than the sum of its proper divisors (138844457).

312399999 is a wasteful number, since it uses less digits than its factorization.

312399999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34711117 (or 34711114 counting only the distinct ones).

The product of its digits is 1062882, while the sum is 54.

The square root of 312399999 is about 17674.8408479398. The cubic root of 312399999 is about 678.5320112326.

The spelling of 312399999 in words is "three hundred twelve million, three hundred ninety-nine thousand, nine hundred ninety-nine".