871847 has 4 divisors (see below), whose sum is σ = 873936. Its totient is φ = 869760.

The previous prime is 871837. The next prime is 871867. The reversal of 871847 is 748178.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748178 = 2 ⋅374089.

It is a cyclic number.

It is not a de Polignac number, because 871847 - 2¹⁰ = 870823 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 (871817) 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, 179 + ... + 1332.

It is an arithmetic number, because the mean of its divisors is an integer number (218484).

2⁸⁷¹⁸⁴⁷ is an apocalyptic number.

871847 is a deficient number, since it is larger than the sum of its proper divisors (2089).

871847 is a wasteful number, since it uses less digits than its factorization.

871847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088.

The product of its digits is 12544, while the sum is 35.

The square root of 871847 is about 933.7274763013. The cubic root of 871847 is about 95.5315356869.

It can be divided in two parts, 871 and 847, that multiplied together give a palindrome (737737).

The spelling of 871847 in words is "eight hundred seventy-one thousand, eight hundred forty-seven".