99903 has 4 divisors (see below), whose sum is σ = 133208. Its totient is φ = 66600.

The previous prime is 99901. The next prime is 99907. The reversal of 99903 is 30999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30999 = 3 ⋅10333.

It is not a de Polignac number, because 99903 - 2¹ = 99901 is a prime.

It is a D-number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99901) 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, 16648 + ... + 16653.

It is an arithmetic number, because the mean of its divisors is an integer number (33302).

2⁹⁹⁹⁰³ is an apocalyptic number.

99903 is a deficient number, since it is larger than the sum of its proper divisors (33305).

99903 is a wasteful number, since it uses less digits than its factorization.

99903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33304.

The product of its (nonzero) digits is 2187, while the sum is 30.

The square root of 99903 is about 316.0743583399. The cubic root of 99903 is about 46.4008756771.

The spelling of 99903 in words is "ninety-nine thousand, nine hundred three".