312449639 has 2 divisors, whose sum is σ = 312449640. Its totient is φ = 312449638.

The previous prime is 312449617. The next prime is 312449677. The reversal of 312449639 is 936944213.

It is a weak prime.

It is an emirp because it is prime and its reverse (936944213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312449639 - 2¹⁶ = 312384103 is a prime.

It is a super-2 number, since 2×312449639² = 195249553822460642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 312449596 and 312449605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312449689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156224819 + 156224820.

It is an arithmetic number, because the mean of its divisors is an integer number (156224820).

Almost surely, 2^312449639 is an apocalyptic number.

312449639 is a deficient number, since it is larger than the sum of its proper divisors (1).

312449639 is an equidigital number, since it uses as much as digits as its factorization.

312449639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 41.

The square root of 312449639 is about 17676.2450480864. The cubic root of 312449639 is about 678.5679486475.

The spelling of 312449639 in words is "three hundred twelve million, four hundred forty-nine thousand, six hundred thirty-nine".