855871 has 4 divisors (see below), whose sum is σ = 860544. Its totient is φ = 851200.

The previous prime is 855863. The next prime is 855887. The reversal of 855871 is 178558.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 855871 - 2³ = 855863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855821) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2050 + ... + 2431.

It is an arithmetic number, because the mean of its divisors is an integer number (215136).

2⁸⁵⁵⁸⁷¹ is an apocalyptic number.

855871 is a deficient number, since it is larger than the sum of its proper divisors (4673).

855871 is a wasteful number, since it uses less digits than its factorization.

855871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4672.

The product of its digits is 11200, while the sum is 34.

The square root of 855871 is about 925.1329634166. The cubic root of 855871 is about 94.9444180871.

The spelling of 855871 in words is "eight hundred fifty-five thousand, eight hundred seventy-one".