300 Mathematically

1. It is a triangular number.

2. It is the sum of first 24 numbers.
1 + 2 + 3 + ---- + 24 = 300

3. It is also the sum of two consecutive primes, called twin primes
300 = 149 + 151

4. It is the sum of 10 consecutive primes
13+ 17+ 19+ 23 + 29 + 31 + 37 + 41 + 43 + 47

5. It is a palindrome number in 3 consecutive  bases
606₇ = 454₈ = 363₉,

6. In Roman numeral system 
300 = CCC

7. It is the product of three primes 
300 = 2^2 x 3 x 5^2

Dr Rajesh Kumar Thakur