The question is, what kind of numbers could be rounded up to 500 000?
Depending on how we round, if we round to 1 000, then:
from 499 500 till 500 499
if we round to the nearest 10 000 then: (I find this most probable)
495 000 to 504 999
if we round up to the nearest 100 000:
450 000 to 549 999
