871684869 has 16 divisors (see below), whose sum is σ = 1334638080. Its totient is φ = 500488560.

The previous prime is 871684837. The next prime is 871684901. The reversal of 871684869 is 968486178.

It is an interprime number because it is at equal distance from previous prime (871684837) and next prime (871684901).

It is not a de Polignac number, because 871684869 - 2⁵ = 871684837 is a prime.

It is a super-2 number, since 2×871684869² = 1519669021687094322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871684819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 694497 + ... + 695750.

It is an arithmetic number, because the mean of its divisors is an integer number (83414880).

Almost surely, 2^871684869 is an apocalyptic number.

It is an amenable number.

871684869 is a deficient number, since it is larger than the sum of its proper divisors (462953211).

871684869 is a wasteful number, since it uses less digits than its factorization.

871684869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390280.

The product of its digits is 4644864, while the sum is 57.

The square root of 871684869 is about 29524.3097971824. The cubic root of 871684869 is about 955.2561355313.

The spelling of 871684869 in words is "eight hundred seventy-one million, six hundred eighty-four thousand, eight hundred sixty-nine".