809593 has 4 divisors (see below), whose sum is σ = 837540. Its totient is φ = 781648.

The previous prime is 809587. The next prime is 809603. The reversal of 809593 is 395908.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 627264 + 182329 = 792^2 + 427^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809563) 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 in 3 ways as a sum of consecutive naturals, for example, 13930 + ... + 13987.

It is an arithmetic number, because the mean of its divisors is an integer number (209385).

2⁸⁰⁹⁵⁹³ is an apocalyptic number.

It is an amenable number.

809593 is a deficient number, since it is larger than the sum of its proper divisors (27947).

809593 is a wasteful number, since it uses less digits than its factorization.

809593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27946.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 809593 is about 899.7738604783. The cubic root of 809593 is about 93.2013596786.

The spelling of 809593 in words is "eight hundred nine thousand, five hundred ninety-three".