871859 has 4 divisors (see below), whose sum is σ = 873840. Its totient is φ = 869880.

The previous prime is 871837. The next prime is 871867. The reversal of 871859 is 958178.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-871859 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (871159) 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, 2 + ... + 1320.

It is an arithmetic number, because the mean of its divisors is an integer number (218460).

2⁸⁷¹⁸⁵⁹ is an apocalyptic number.

871859 is a deficient number, since it is larger than the sum of its proper divisors (1981).

871859 is a wasteful number, since it uses less digits than its factorization.

871859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980.

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

The square root of 871859 is about 933.7339021370. The cubic root of 871859 is about 95.5319739798.

The spelling of 871859 in words is "eight hundred seventy-one thousand, eight hundred fifty-nine".