809913 has 16 divisors (see below), whose sum is σ = 1225280. Its totient is φ = 471744.

The previous prime is 809909. The next prime is 809917. The reversal of 809913 is 319908.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (809909) and next prime (809917).

It is not a de Polignac number, because 809913 - 2² = 809909 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 809913.

It is not an unprimeable number, because it can be changed into a prime (809917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195 + ... + 1287.

It is an arithmetic number, because the mean of its divisors is an integer number (76580).

2⁸⁰⁹⁹¹³ is an apocalyptic number.

It is an amenable number.

809913 is a deficient number, since it is larger than the sum of its proper divisors (415367).

809913 is a wasteful number, since it uses less digits than its factorization.

809913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 809913 is about 899.9516653688. The cubic root of 809913 is about 93.2136376612.

The spelling of 809913 in words is "eight hundred nine thousand, nine hundred thirteen".