It's sold 1.6m in its first 16months. 4m is on lock.
I was looking for 1.38 but I forgot to see the digital only version
Regardless, the numbers (standard+ DE combined) are down 16% YoY, Sony isn't really prioritizing stocks in Japan, not when PS5 software can't sell a thing, and they are likely to keep really low until chip issues are fixed which may happen in... 2024 maybe? I think it will cross 4 million, but will take a while and definitely won't go much further