809846823 has 12 divisors (see below), whose sum is σ = 1139619768. Its totient is φ = 511481520.

The previous prime is 809846819. The next prime is 809846881. The reversal of 809846823 is 328648908.

It is a happy number.

It is not a de Polignac number, because 809846823 - 2² = 809846819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809846893) 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 in 11 ways as a sum of consecutive naturals, for example, 372808 + ... + 374973.

It is an arithmetic number, because the mean of its divisors is an integer number (94968314).

Almost surely, 2^809846823 is an apocalyptic number.

809846823 is a deficient number, since it is larger than the sum of its proper divisors (329772945).

809846823 is a wasteful number, since it uses less digits than its factorization.

809846823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747822 (or 747803 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The square root of 809846823 is about 28457.8077686950. The cubic root of 809846823 is about 932.1109880134.

The spelling of 809846823 in words is "eight hundred nine million, eight hundred forty-six thousand, eight hundred twenty-three".