9897909 has 16 divisors (see below), whose sum is σ = 15368832. Its totient is φ = 5548608.

The previous prime is 9897887. The next prime is 9897913. The reversal of 9897909 is 9097989.

9897909 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9897909 - 2⁸ = 9897653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9897919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3334 + ... + 5559.

It is an arithmetic number, because the mean of its divisors is an integer number (960552).

Almost surely, 2^9897909 is an apocalyptic number.

It is an amenable number.

9897909 is a deficient number, since it is larger than the sum of its proper divisors (5470923).

9897909 is a wasteful number, since it uses less digits than its factorization.

9897909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8956.

The product of its (nonzero) digits is 367416, while the sum is 51.

The square root of 9897909 is about 3146.0942452508. The cubic root of 9897909 is about 214.7077984765.

The spelling of 9897909 in words is "nine million, eight hundred ninety-seven thousand, nine hundred nine".