809399 has 2 divisors, whose sum is σ = 809400. Its totient is φ = 809398.

The previous prime is 809383. The next prime is 809401. The reversal of 809399 is 993908.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809399 - 2⁴ = 809383 is a prime.

Together with 809401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404699 + 404700.

It is an arithmetic number, because the mean of its divisors is an integer number (404700).

2⁸⁰⁹³⁹⁹ is an apocalyptic number.

809399 is a deficient number, since it is larger than the sum of its proper divisors (1).

809399 is an equidigital number, since it uses as much as digits as its factorization.

809399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 809399 is about 899.6660491538. Note that the first 3 decimals coincide. The cubic root of 809399 is about 93.1939145762.

It can be divided in two parts, 8093 and 99, that added together give a 13-th power (8192 = 2¹³).

The spelling of 809399 in words is "eight hundred nine thousand, three hundred ninety-nine".