869871 has 4 divisors (see below), whose sum is σ = 1159832. Its totient is φ = 579912.

The previous prime is 869863. The next prime is 869879. The reversal of 869871 is 178968.

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

It is an interprime number because it is at equal distance from previous prime (869863) and next prime (869879).

It is not a de Polignac number, because 869871 - 2³ = 869863 is a prime.

It is a D-number.

It is a Duffinian number.

869871 is a lucky 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 869871.

It is not an unprimeable number, because it can be changed into a prime (869879) 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, 144976 + ... + 144981.

It is an arithmetic number, because the mean of its divisors is an integer number (289958).

2⁸⁶⁹⁸⁷¹ is an apocalyptic number.

869871 is a deficient number, since it is larger than the sum of its proper divisors (289961).

869871 is a wasteful number, since it uses less digits than its factorization.

869871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289960.

The product of its digits is 24192, while the sum is 39.

The square root of 869871 is about 932.6687514868. The cubic root of 869871 is about 95.4593085234.

The spelling of 869871 in words is "eight hundred sixty-nine thousand, eight hundred seventy-one".