No the max for Health is lower (around 600) - the 1800 figure is for Magicka.
The other thing to note is that those numbers aren't instant, but the total over some time period. Increasing your Alchemy skill makes your Restore xxx potion give you more xxx per second, for more seconds, so that health value may be 10 per second for 60 seconds = 600 total, and only with Alchemy skill at 100, with the best possible equipment, would you be able to make it.