9999684 has 36 divisors (see below), whose sum is σ = 25569180. Its totient is φ = 3294720.

The previous prime is 9999677. The next prime is 9999713. The reversal of 9999684 is 4869999.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 562500 + 9437184 = 750^2 + 3072^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 9999684.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1644 + ... + 4764.

It is an arithmetic number, because the mean of its divisors is an integer number (710255).

Almost surely, 2^9999684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9999684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12784590).

9999684 is an abundant number, since it is smaller than the sum of its proper divisors (15569496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9999684 is a wasteful number, since it uses less digits than its factorization.

9999684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220 (or 3215 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 9999684 is about 3162.2276957866. The cubic root of 9999684 is about 215.4411996414.

The spelling of 9999684 in words is "nine million, nine hundred ninety-nine thousand, six hundred eighty-four".