842871 has 4 divisors (see below), whose sum is σ = 1123832. Its totient is φ = 561912.

The previous prime is 842869. The next prime is 842879. The reversal of 842871 is 178248.

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

It is not a de Polignac number, because 842871 - 2¹ = 842869 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842879) 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 3 ways as a sum of consecutive naturals, for example, 140476 + ... + 140481.

It is an arithmetic number, because the mean of its divisors is an integer number (280958).

2⁸⁴²⁸⁷¹ is an apocalyptic number.

842871 is a deficient number, since it is larger than the sum of its proper divisors (280961).

842871 is a wasteful number, since it uses less digits than its factorization.

842871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280960.

The product of its digits is 3584, while the sum is 30.

The square root of 842871 is about 918.0800618682. The cubic root of 842871 is about 94.4612533968.

The spelling of 842871 in words is "eight hundred forty-two thousand, eight hundred seventy-one".