9909889 has 8 divisors (see below), whose sum is σ = 10836000. Its totient is φ = 8988000.

The previous prime is 9909881. The next prime is 9909901. The reversal of 9909889 is 9889099.

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 9909889 - 2³ = 9909881 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 (9909881) 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 7 ways as a sum of consecutive naturals, for example, 5862 + ... + 7360.

It is an arithmetic number, because the mean of its divisors is an integer number (1354500).

Almost surely, 2^9909889 is an apocalyptic number.

It is an amenable number.

9909889 is a deficient number, since it is larger than the sum of its proper divisors (926111).

9909889 is a wasteful number, since it uses less digits than its factorization.

9909889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 9909889 is about 3147.9976175340. The cubic root of 9909889 is about 214.7943878886.

The spelling of 9909889 in words is "nine million, nine hundred nine thousand, eight hundred eighty-nine".