869831 has 4 divisors (see below), whose sum is σ = 871872. Its totient is φ = 867792.

The previous prime is 869819. The next prime is 869849. The reversal of 869831 is 138968.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-869831 is a prime.

It is a super-2 number, since 2×869831² = 1513211937122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 869791 and 869800.

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 869831.

It is not an unprimeable number, because it can be changed into a prime (869131) 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 3 ways as a sum of consecutive naturals, for example, 110 + ... + 1323.

It is an arithmetic number, because the mean of its divisors is an integer number (217968).

2⁸⁶⁹⁸³¹ is an apocalyptic number.

869831 is a deficient number, since it is larger than the sum of its proper divisors (2041).

869831 is a wasteful number, since it uses less digits than its factorization.

869831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

The product of its digits is 10368, while the sum is 35.

The square root of 869831 is about 932.6473073997. The cubic root of 869831 is about 95.4578453061.

The spelling of 869831 in words is "eight hundred sixty-nine thousand, eight hundred thirty-one".