9869 has 4 divisors (see below), whose sum is σ = 10080. Its totient is φ = 9660.

The previous prime is 9859. The next prime is 9871. The reversal of 9869 is 9689.

It is a happy number.

9869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9869 - 2⁸ = 9613 is a prime.

It is a super-2 number, since 2×9869² = 194794322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2 + ... + 140.

It is an arithmetic number, because the mean of its divisors is an integer number (2520).

2⁹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

9869 is a deficient number, since it is larger than the sum of its proper divisors (211).

9869 is a wasteful number, since it uses less digits than its factorization.

9869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210.

The product of its digits is 3888, while the sum is 32.

The square root of 9869 is about 99.3428407083. The cubic root of 9869 is about 21.4498560999.

It can be divided in two parts, 9 and 869, that added together give a palindrome (878).

The spelling of 9869 in words is "nine thousand, eight hundred sixty-nine".