812787923 has 2 divisors, whose sum is σ = 812787924. Its totient is φ = 812787922.

The previous prime is 812787883. The next prime is 812788051. The reversal of 812787923 is 329787218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 812787923 - 2¹⁰ = 812786899 is a prime.

It is not a weakly prime, because it can be changed into another prime (817787923) 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, 406393961 + 406393962.

It is an arithmetic number, because the mean of its divisors is an integer number (406393962).

Almost surely, 2^812787923 is an apocalyptic number.

812787923 is a deficient number, since it is larger than the sum of its proper divisors (1).

812787923 is an equidigital number, since it uses as much as digits as its factorization.

812787923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 47.

The square root of 812787923 is about 28509.4356836469. The cubic root of 812787923 is about 933.2379993470.

The spelling of 812787923 in words is "eight hundred twelve million, seven hundred eighty-seven thousand, nine hundred twenty-three".