809243 has 2 divisors, whose sum is σ = 809244. Its totient is φ = 809242.

The previous prime is 809239. The next prime is 809261. The reversal of 809243 is 342908.

809243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 809243 - 2² = 809239 is a prime.

It is a super-4 number, since 4×809243⁴ (a number of 25 digits) contains 4444 as substring.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (809203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404621 + 404622.

It is an arithmetic number, because the mean of its divisors is an integer number (404622).

2⁸⁰⁹²⁴³ is an apocalyptic number.

809243 is a deficient number, since it is larger than the sum of its proper divisors (1).

809243 is an equidigital number, since it uses as much as digits as its factorization.

809243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 809243 is about 899.5793461391. The cubic root of 809243 is about 93.1879269299.

The spelling of 809243 in words is "eight hundred nine thousand, two hundred forty-three".