809023 has 2 divisors, whose sum is σ = 809024. Its totient is φ = 809022.

The previous prime is 808993. The next prime is 809041. The reversal of 809023 is 320908.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809023 - 2⁵ = 808991 is a prime.

It is equal to p₆₄₆₀₆ and since 809023 and 64606 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 808985 and 809003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809063) 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, 404511 + 404512.

It is an arithmetic number, because the mean of its divisors is an integer number (404512).

2⁸⁰⁹⁰²³ is an apocalyptic number.

809023 is a deficient number, since it is larger than the sum of its proper divisors (1).

809023 is an equidigital number, since it uses as much as digits as its factorization.

809023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 809023 is about 899.4570584525. The cubic root of 809023 is about 93.1794815054.

The spelling of 809023 in words is "eight hundred nine thousand, twenty-three".