871806 has 16 divisors (see below), whose sum is σ = 1877904. Its totient is φ = 268224.

The previous prime is 871789. The next prime is 871817. The reversal of 871806 is 608178.

It is a Curzon number.

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 871806.

It is an unprimeable number.

871806 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5511 + ... + 5666.

It is an arithmetic number, because the mean of its divisors is an integer number (117369).

2⁸⁷¹⁸⁰⁶ is an apocalyptic number.

871806 is an abundant number, since it is smaller than the sum of its proper divisors (1006098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

871806 is a wasteful number, since it uses less digits than its factorization.

871806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11195.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 871806 is about 933.7055210290. The cubic root of 871806 is about 95.5300381556.

The spelling of 871806 in words is "eight hundred seventy-one thousand, eight hundred six".