871889 has 4 divisors (see below), whose sum is σ = 874224. Its totient is φ = 869556.

The previous prime is 871883. The next prime is 871901. The reversal of 871889 is 988178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 871889 - 2¹² = 867793 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 871889.

It is not an unprimeable number, because it can be changed into a prime (871883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467 + ... + 1400.

It is an arithmetic number, because the mean of its divisors is an integer number (218556).

2⁸⁷¹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

871889 is a deficient number, since it is larger than the sum of its proper divisors (2335).

871889 is a wasteful number, since it uses less digits than its factorization.

871889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334.

The product of its digits is 32256, while the sum is 41.

The square root of 871889 is about 933.7499665328. The cubic root of 871889 is about 95.5330696946.

The spelling of 871889 in words is "eight hundred seventy-one thousand, eight hundred eighty-nine".