809443 has 2 divisors, whose sum is σ = 809444. Its totient is φ = 809442.

The previous prime is 809437. The next prime is 809447. The reversal of 809443 is 344908.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809443 - 2¹⁷ = 678371 is a prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (809447) 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, 404721 + 404722.

It is an arithmetic number, because the mean of its divisors is an integer number (404722).

2⁸⁰⁹⁴⁴³ is an apocalyptic number.

809443 is a deficient number, since it is larger than the sum of its proper divisors (1).

809443 is an equidigital number, since it uses as much as digits as its factorization.

809443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 809443 is about 899.6905023396. The cubic root of 809443 is about 93.1956032604.

The spelling of 809443 in words is "eight hundred nine thousand, four hundred forty-three".