312020399 has 2 divisors, whose sum is σ = 312020400. Its totient is φ = 312020398.

The previous prime is 312020393. The next prime is 312020441. The reversal of 312020399 is 993020213.

It is a weak prime.

It is an emirp because it is prime and its reverse (993020213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312020399 - 2¹² = 312016303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312020393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156010199 + 156010200.

It is an arithmetic number, because the mean of its divisors is an integer number (156010200).

Almost surely, 2^312020399 is an apocalyptic number.

312020399 is a deficient number, since it is larger than the sum of its proper divisors (1).

312020399 is an equidigital number, since it uses as much as digits as its factorization.

312020399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 312020399 is about 17664.0991561981. The cubic root of 312020399 is about 678.2570697598.

The spelling of 312020399 in words is "three hundred twelve million, twenty thousand, three hundred ninety-nine".