500 (five hundred) is the natural number following 499 and preceding 501. 

500 is a Harshad number in bases 5, 6, 10, 11, 13, 15 and 16. 

Five hundred is also 



501 = 3 × 167. It is: 502 = 2 × 251, also a proposed HTTP status code for indicating server is temporarily overloaded, SMTP status code meaning command not implemented 503 is: 504 = 2 × 3 × 7. It is: 505 = 5 × 101, Harshad number in bases 3, 5 and 6 

This number is the magic constant of "n"×"n" normal magic square and "n"-queens problem for "n" = 10. 

New Mexico – Before October 7, 2007, The United States state of New Mexico had a single area code of 505. The state was, and still is, referred to as 'the 505' in slang. 506 = 2 × 11 × 23. It is: 507 = 3 × 13, Harshad number in bases 13 and 14. 508 = 2 × 127, sum of four consecutive primes (113 + 127 + 131 + 137), Harshad number in base 13. 509 is: 

510 = 2 × 3 × 5 × 17. It is: 511 = 7 × 73. It is: 512 = 2. It is: 513 = 3 × 19. It is: 514 = 2 × 257, it is: 515 = 5 × 103, it is: 516 = 2 × 3 × 43, it is: 517 = 11 × 47, it is: 518 = 2 × 7 × 37, it is: 519 = 3 × 173, it is:
what date did the area code change in NM
what was the code
what type of number is 500
what comes before 500
and after?
what are a few bases
what number equals "n" in the article
are there more odd or even bases of 500
what are the four consecutive primes? (they are in parenthesis)
what is the HTTP status code for
In last paragraph, what does 7 x 73 equal
what does 3 x 19 equal
October 7, 2007,
Before October 7, 2007, The United States state of New Mexico had a single area code of 505. 
505
 New Mexico had a single area code of 505
a natural one
500 (five hundred) is the natural number 
499
500 (five hundred) is the natural number following 499
501.
500 (five hundred) is the natural number following 499 and preceding 501.
bases 5,&  6,
500 is a Harshad number in bases 5, 6, 10, 11, 13, 15 and 16. 
505
505 = 5 × 101, Harshad number in bases 3, 5 and 6 

This number is the magic constant of "n"×"n" normal magic square and "n"-queens problem for "n" = 10. 
odd
500 is a Harshad number in bases 5, 6, 10, 11, 13, 15 and 16. 
113, 127, 131,137
sum of four consecutive primes (113 + 127 + 131 + 137),
indicating server is temporarily overloaded,
 502 = 2 × 251, also a proposed HTTP status code for indicating server is temporarily overloaded, 
511
 It is: 511 = 7 × 73
513
 It is: 513 = 3 × 19