9989909 has 8 divisors (see below), whose sum is σ = 10203960. Its totient is φ = 9777600.

The previous prime is 9989899. The next prime is 9989921. The reversal of 9989909 is 9099899.

It is a happy number.

9989909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1562500 + 8427409 = 1250^2 + 2903^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9989909 - 2²⁰ = 8941333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9989509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23519 + ... + 23939.

It is an arithmetic number, because the mean of its divisors is an integer number (1275495).

Almost surely, 2^9989909 is an apocalyptic number.

It is an amenable number.

9989909 is a deficient number, since it is larger than the sum of its proper divisors (214051).

9989909 is a wasteful number, since it uses less digits than its factorization.

9989909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871.

The product of its (nonzero) digits is 472392, while the sum is 53.

The square root of 9989909 is about 3160.6817302601. The cubic root of 9989909 is about 215.3709766122.

The spelling of 9989909 in words is "nine million, nine hundred eighty-nine thousand, nine hundred nine".