812923399 has 2 divisors, whose sum is σ = 812923400. Its totient is φ = 812923398.

The previous prime is 812923387. The next prime is 812923409. The reversal of 812923399 is 993329218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 812923399 - 2²⁹ = 276052487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812923369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406461699 + 406461700.

It is an arithmetic number, because the mean of its divisors is an integer number (406461700).

Almost surely, 2^812923399 is an apocalyptic number.

812923399 is a deficient number, since it is larger than the sum of its proper divisors (1).

812923399 is an equidigital number, since it uses as much as digits as its factorization.

812923399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 46.

The square root of 812923399 is about 28511.8115699441. The cubic root of 812923399 is about 933.2898473645.

The spelling of 812923399 in words is "eight hundred twelve million, nine hundred twenty-three thousand, three hundred ninety-nine".