That is a boat load of poly's. The idea of using mudbox and maya is to ship a base mesh to mudbox, subdivide to a gazillion poly's then sculpt, and then create a normal map, and send that back to maya and apply it to the base mesh.

That being said, I have built models in maya with over 2 million poly's and that was with my 2GB of memory system so you should be able to handle 1.4M poly's.