40
That includes its ability to return to the wielder when thrown. I just tested it out and the weapon came right back (so I would assume that the disarm immunity applies, too). Seems like that might be useful for a throwing barbarian build (tavern brawler, throwing ring/gauntlets, etc.) and I wanted to share. It'll probably get patched in the future, but I haven't reported just to see if anyone can come up with something broken.
Well, that's not going to last long 🤪