9903909 has 4 divisors (see below), whose sum is σ = 13205216. Its totient is φ = 6602604.

The previous prime is 9903871. The next prime is 9903913. The reversal of 9903909 is 9093099.

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 de Polignac number, because none of the positive numbers 2^k-9903909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9903989) 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 3 ways as a sum of consecutive naturals, for example, 1650649 + ... + 1650654.

It is an arithmetic number, because the mean of its divisors is an integer number (3301304).

Almost surely, 2^9903909 is an apocalyptic number.

It is an amenable number.

9903909 is a deficient number, since it is larger than the sum of its proper divisors (3301307).

9903909 is a wasteful number, since it uses less digits than its factorization.

9903909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301306.

The product of its (nonzero) digits is 19683, while the sum is 39.

The square root of 9903909 is about 3147.0476640814. The cubic root of 9903909 is about 214.7511741892.

The spelling of 9903909 in words is "nine million, nine hundred three thousand, nine hundred nine".