812506439 has 2 divisors, whose sum is σ = 812506440. Its totient is φ = 812506438.

The previous prime is 812506433. The next prime is 812506451. The reversal of 812506439 is 934605218.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 812506439 - 2¹⁶ = 812440903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812506433) 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, 406253219 + 406253220.

It is an arithmetic number, because the mean of its divisors is an integer number (406253220).

Almost surely, 2^812506439 is an apocalyptic number.

812506439 is a deficient number, since it is larger than the sum of its proper divisors (1).

812506439 is an equidigital number, since it uses as much as digits as its factorization.

812506439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 812506439 is about 28504.4985747864. The cubic root of 812506439 is about 933.1302541865.

The spelling of 812506439 in words is "eight hundred twelve million, five hundred six thousand, four hundred thirty-nine".