812871 has 12 divisors (see below), whose sum is σ = 1183000. Its totient is φ = 537840.

The previous prime is 812869. The next prime is 812921. The reversal of 812871 is 178218.

It is not a de Polignac number, because 812871 - 2¹ = 812869 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 (812671) 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 11 ways as a sum of consecutive naturals, for example, 1380 + ... + 1878.

2⁸¹²⁸⁷¹ is an apocalyptic number.

812871 is a deficient number, since it is larger than the sum of its proper divisors (370129).

812871 is a wasteful number, since it uses less digits than its factorization.

812871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 683 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 812871 is about 901.5935891520. The cubic root of 812871 is about 93.3269794427.

The spelling of 812871 in words is "eight hundred twelve thousand, eight hundred seventy-one".