810856 has 16 divisors (see below), whose sum is σ = 1540800. Its totient is φ = 399984.

The previous prime is 810853. The next prime is 810871. The reversal of 810856 is 658018.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (810853) 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 3 ways as a sum of consecutive naturals, for example, 10 + ... + 1273.

It is an arithmetic number, because the mean of its divisors is an integer number (96300).

2⁸¹⁰⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

810856 is a deficient number, since it is larger than the sum of its proper divisors (729944).

810856 is a wasteful number, since it uses less digits than its factorization.

810856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368 (or 1364 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 810856 is about 900.4754299813. The cubic root of 810856 is about 93.2498005444.

The spelling of 810856 in words is "eight hundred ten thousand, eight hundred fifty-six".