813841 has 12 divisors (see below), whose sum is σ = 1003428. Its totient is φ = 655872.

The previous prime is 813833. The next prime is 813847. The reversal of 813841 is 148318.

It can be written as a sum of positive squares in 2 ways, for example, as 705600 + 108241 = 840^2 + 329^2 .

It is not a de Polignac number, because 813841 - 2³ = 813833 is a prime.

It is a Duffinian number.

813841 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813841.

It is not an unprimeable number, because it can be changed into a prime (813847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 345 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (83619).

2⁸¹³⁸⁴¹ is an apocalyptic number.

It is an amenable number.

813841 is a deficient number, since it is larger than the sum of its proper divisors (189587).

813841 is a wasteful number, since it uses less digits than its factorization.

813841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008 (or 1001 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 813841 is about 902.1313651570. The cubic root of 813841 is about 93.3640870876.

The spelling of 813841 in words is "eight hundred thirteen thousand, eight hundred forty-one".