312439969 has 2 divisors, whose sum is σ = 312439970. Its totient is φ = 312439968.

The previous prime is 312439949. The next prime is 312440017. The reversal of 312439969 is 969934213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158382225 + 154057744 = 12585^2 + 12412^2 .

It is a cyclic number.

It is not a de Polignac number, because 312439969 - 2¹¹ = 312437921 is a prime.

It is a super-2 number, since 2×312439969² = 195237468457441922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312439949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156219984 + 156219985.

It is an arithmetic number, because the mean of its divisors is an integer number (156219985).

Almost surely, 2^312439969 is an apocalyptic number.

It is an amenable number.

312439969 is a deficient number, since it is larger than the sum of its proper divisors (1).

312439969 is an equidigital number, since it uses as much as digits as its factorization.

312439969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 46.

The square root of 312439969 is about 17675.9715150257. The cubic root of 312439969 is about 678.5609482449.

The spelling of 312439969 in words is "three hundred twelve million, four hundred thirty-nine thousand, nine hundred sixty-nine".