312320399 has 2 divisors, whose sum is σ = 312320400. Its totient is φ = 312320398.

The previous prime is 312320389. The next prime is 312320419. The reversal of 312320399 is 993023213.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312320399 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312320389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156160199 + 156160200.

It is an arithmetic number, because the mean of its divisors is an integer number (156160200).

Almost surely, 2^312320399 is an apocalyptic number.

312320399 is a deficient number, since it is larger than the sum of its proper divisors (1).

312320399 is an equidigital number, since it uses as much as digits as its factorization.

312320399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 312320399 is about 17672.5889161718. The cubic root of 312320399 is about 678.4743760039.

The spelling of 312320399 in words is "three hundred twelve million, three hundred twenty thousand, three hundred ninety-nine".