312400019 has 2 divisors, whose sum is σ = 312400020. Its totient is φ = 312400018.

The previous prime is 312400009. The next prime is 312400037. The reversal of 312400019 is 910004213.

It is a weak prime.

It is an emirp because it is prime and its reverse (910004213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312400019 - 2⁴ = 312400003 is a prime.

It is a super-2 number, since 2×312400019² = 195187543742400722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312400009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156200009 + 156200010.

It is an arithmetic number, because the mean of its divisors is an integer number (156200010).

Almost surely, 2^312400019 is an apocalyptic number.

312400019 is a deficient number, since it is larger than the sum of its proper divisors (1).

312400019 is an equidigital number, since it uses as much as digits as its factorization.

312400019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 312400019 is about 17674.8414137157. The cubic root of 312400019 is about 678.5320257126.

The spelling of 312400019 in words is "three hundred twelve million, four hundred thousand, nineteen".