9903 has 4 divisors (see below), whose sum is σ = 13208. Its totient is φ = 6600.

The previous prime is 9901. The next prime is 9907. The reversal of 9903 is 3099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3099 = 3 ⋅1033.

It is not a de Polignac number, because 9903 - 2¹ = 9901 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 13 and base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 9903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1648 + ... + 1653.

It is an arithmetic number, because the mean of its divisors is an integer number (3302).

2⁹⁹⁰³ is an apocalyptic number.

9903 is a deficient number, since it is larger than the sum of its proper divisors (3305).

9903 is a wasteful number, since it uses less digits than its factorization.

9903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3304.

The product of its (nonzero) digits is 243, while the sum is 21.

The square root of 9903 is about 99.5138181360. The cubic root of 9903 is about 21.4744603895.

The spelling of 9903 in words is "nine thousand, nine hundred three".