I don’t believe in that 19 thing for sure. Otherwise, I do believe that the Quran has mention of things that were scientifically proven much after its revelation.Although with all these code things, I think you mean that this word appears x times and that word appears y times and now science has proven that there is a ratio of x:y type things. I just take these with a grain of salt, especially since I first heard about it through mass forwarded emails.