809239 has 2 divisors, whose sum is σ = 809240. Its totient is φ = 809238.

The previous prime is 809231. The next prime is 809243. The reversal of 809239 is 932908.

It is a happy number.

809239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809239 - 2³ = 809231 is a prime.

809239 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 809239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404619 + 404620.

It is an arithmetic number, because the mean of its divisors is an integer number (404620).

2⁸⁰⁹²³⁹ is an apocalyptic number.

809239 is a deficient number, since it is larger than the sum of its proper divisors (1).

809239 is an equidigital number, since it uses as much as digits as its factorization.

809239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 809239 is about 899.5771228750. The cubic root of 809239 is about 93.1877733904.

The spelling of 809239 in words is "eight hundred nine thousand, two hundred thirty-nine".