810885 has 8 divisors (see below), whose sum is σ = 1297440. Its totient is φ = 432464.

The previous prime is 810881. The next prime is 810893. The reversal of 810885 is 588018.

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

It is a cyclic number.

It is not a de Polignac number, because 810885 - 2² = 810881 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810881) by changing a digit.

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, 27015 + ... + 27044.

It is an arithmetic number, because the mean of its divisors is an integer number (162180).

2⁸¹⁰⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

810885 is a deficient number, since it is larger than the sum of its proper divisors (486555).

810885 is a wasteful number, since it uses less digits than its factorization.

810885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54067.

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 810885 is about 900.4915324421. The cubic root of 810885 is about 93.2509122140.

The spelling of 810885 in words is "eight hundred ten thousand, eight hundred eighty-five".