871839 has 12 divisors (see below), whose sum is σ = 1277536. Its totient is φ = 572832.

The previous prime is 871837. The next prime is 871867. The reversal of 871839 is 938178.

It is not a de Polignac number, because 871839 - 2¹ = 871837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 871839.

It is not an unprimeable number, because it can be changed into a prime (871837) 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 11 ways as a sum of consecutive naturals, for example, 7 + ... + 1320.

2⁸⁷¹⁸³⁹ is an apocalyptic number.

871839 is a deficient number, since it is larger than the sum of its proper divisors (405697).

871839 is a wasteful number, since it uses less digits than its factorization.

871839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406 (or 1403 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 871839 is about 933.7231923863. The cubic root of 871839 is about 95.5312434893.

The spelling of 871839 in words is "eight hundred seventy-one thousand, eight hundred thirty-nine".