859871 has 4 divisors (see below), whose sum is σ = 879912. Its totient is φ = 839832.

The previous prime is 859861. The next prime is 859891. The reversal of 859871 is 178958.

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 859871 - 2¹⁴ = 843487 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (859801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9956 + ... + 10041.

It is an arithmetic number, because the mean of its divisors is an integer number (219978).

2⁸⁵⁹⁸⁷¹ is an apocalyptic number.

859871 is a deficient number, since it is larger than the sum of its proper divisors (20041).

859871 is a wasteful number, since it uses less digits than its factorization.

859871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20040.

The product of its digits is 20160, while the sum is 38.

The square root of 859871 is about 927.2922948025. The cubic root of 859871 is about 95.0920990501.

The spelling of 859871 in words is "eight hundred fifty-nine thousand, eight hundred seventy-one".