813813 has 32 divisors (see below), whose sum is σ = 1462272. Its totient is φ = 388800.

The previous prime is 813811. The next prime is 813817. The reversal of 813813 is 318318.

It is not a de Polignac number, because 813813 - 2¹ = 813811 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813813.

It is not an unprimeable number, because it can be changed into a prime (813811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2868 + ... + 3138.

It is an arithmetic number, because the mean of its divisors is an integer number (45696).

2⁸¹³⁸¹³ is an apocalyptic number.

It is an amenable number.

813813 is a deficient number, since it is larger than the sum of its proper divisors (648459).

813813 is a wasteful number, since it uses less digits than its factorization.

813813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305.

The product of its digits is 576, while the sum is 24.

The square root of 813813 is about 902.1158462193. The cubic root of 813813 is about 93.3630163525.

The spelling of 813813 in words is "eight hundred thirteen thousand, eight hundred thirteen".