813879 has 12 divisors (see below), whose sum is σ = 1282632. Its totient is φ = 493200.

The previous prime is 813871. The next prime is 813893. The reversal of 813879 is 978318.

It is not a de Polignac number, because 813879 - 2³ = 813871 is a prime.

813879 is a lucky number.

It is a plaindrome in base 15.

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 813879.

It is not an unprimeable number, because it can be changed into a prime (813871) 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, 4012 + ... + 4209.

It is an arithmetic number, because the mean of its divisors is an integer number (106886).

2⁸¹³⁸⁷⁹ is an apocalyptic number.

813879 is a deficient number, since it is larger than the sum of its proper divisors (468753).

813879 is a wasteful number, since it uses less digits than its factorization.

813879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8238 (or 8235 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 813879 is about 902.1524261454. The cubic root of 813879 is about 93.3655401888.

The spelling of 813879 in words is "eight hundred thirteen thousand, eight hundred seventy-nine".