871804 has 12 divisors (see below), whose sum is σ = 1548904. Its totient is φ = 429264.

The previous prime is 871789. The next prime is 871817. The reversal of 871804 is 408178.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

871804 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1359 + ... + 1894.

2⁸⁷¹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

871804 is a deficient number, since it is larger than the sum of its proper divisors (677100).

871804 is a wasteful number, since it uses less digits than its factorization.

871804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3324 (or 3322 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 871804 is about 933.7044500269. The cubic root of 871804 is about 95.5299651041.

It can be divided in two parts, 87 and 1804, that added together give a triangular number (1891 = T₆₁).

The spelling of 871804 in words is "eight hundred seventy-one thousand, eight hundred four".