I don't remember my exact score but it was around 90X,XXX on Hardest mode and a little more than that on Normal. These were all cleared games.
I've never reached 1MiL before but I was always curious as well. The high-score board looks like it only supports 6-digits but I could never get the extra points to see for myself.
Guess this doesn't really answer your question but just my thoughts on this game as well.