9909903 has 16 divisors (see below), whose sum is σ = 13708800. Its totient is φ = 6363456.

The previous prime is 9909901. The next prime is 9909917. The reversal of 9909903 is 3099099.

It is a Cunningham number, because it is equal to 3148²-1.

It is not a de Polignac number, because 9909903 - 2¹ = 9909901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9909901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8923 + ... + 9971.

It is an arithmetic number, because the mean of its divisors is an integer number (856800).

Almost surely, 2^9909903 is an apocalyptic number.

9909903 is a deficient number, since it is larger than the sum of its proper divisors (3798897).

9909903 is a wasteful number, since it uses less digits than its factorization.

9909903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166.

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

The square root of 9909903 is about 3147.9998411690. Note that the first 3 decimals coincide. The cubic root of 9909903 is about 214.7944890374.

The spelling of 9909903 in words is "nine million, nine hundred nine thousand, nine hundred three".