Mariah Carey and Nick Cannon are actually getting along — way better than when they were together and loathed each other — but TMZ has learned there is NO chance of a reconciliation.

TMZ first reported … the divorce is a “done deal” and the couple has been separated since May.

We’re told they are not only on good terms — primarily for the sake of their kids — they even went to dinner Friday in Tribeca and shockingly no one even noticed.

It’s a big improvement from 6 months ago, when there was so much contempt they literally could not be in the same room together.

We’re told it’s all about the kids … they’re both committed to making the divorce as easy as possible on them. But — let’s just say one side tells us — they will NEVER get back together.