811885 has 8 divisors (see below), whose sum is σ = 988416. Its totient is φ = 640080.

The previous prime is 811879. The next prime is 811897. The reversal of 811885 is 588118.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 811885 - 2⁷ = 811757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 789 + ... + 1498.

It is an arithmetic number, because the mean of its divisors is an integer number (123552).

2⁸¹¹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

811885 is a deficient number, since it is larger than the sum of its proper divisors (176531).

811885 is a wasteful number, since it uses less digits than its factorization.

811885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363.

The product of its digits is 2560, while the sum is 31.

The square root of 811885 is about 901.0466136666. The cubic root of 811885 is about 93.2892294458.

The spelling of 811885 in words is "eight hundred eleven thousand, eight hundred eighty-five".