The word “middle nation” is mentioned in Surah Al-Baqarah in verse 143 which is exactly the middle verse: total verses in Surah Al-Baqarah is 286. So 143 is 286/2!!
However, again, what makes this mathematical precision miraculous is the fact that it is incorporated into a book filled with linguistic miracles, numerical miracles, scientific miracles etc. all in a book never changed throughout the last 1400 years..
To see the video and proof of this miracle, see this video: https://youtu.be/6BSn6EN59B0?si=ikmPM2Ha1-1It7cl