813894407 has 2 divisors, whose sum is σ = 813894408. Its totient is φ = 813894406.

The previous prime is 813894349. The next prime is 813894427. The reversal of 813894407 is 704498318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 813894407 - 2⁶ = 813894343 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (813894427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406947203 + 406947204.

It is an arithmetic number, because the mean of its divisors is an integer number (406947204).

Almost surely, 2^813894407 is an apocalyptic number.

813894407 is a deficient number, since it is larger than the sum of its proper divisors (1).

813894407 is an equidigital number, since it uses as much as digits as its factorization.

813894407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 813894407 is about 28528.8346589902. The cubic root of 813894407 is about 933.6612933203.

The spelling of 813894407 in words is "eight hundred thirteen million, eight hundred ninety-four thousand, four hundred seven".