Alas, I missed out on the Numerology discussion by 3 days, but I wanted to add that the practice of numerology was very widespread throughout the Ancient Near East. One of the foremost scholars who studied numerology (he called the discipline numerical harmony) was the Italian Rabbi Umberto Cassuto. As it happens, I teach a university-level class on the Genesis creation accounts, and Cassuto’s findings constitute one whole class and they are fascinating, but…
… he would be the first to tell you that there is NOTHING mystical about numerology in the Bible, if only because the representation of numbers and letters in biblical Hebrew (BH) are identical (e.g., the number 1 and the letter aleph are one and the same). In this way, numerology is relatively straightforward in BH.
The Bible’s authors incorporated numerology into their narratives purposefully to add emphasis to their writings or to express deeper meaning(s). For example, the first creation story is written according to a numerology of sevens (emphasing completeness and finality). The point I would like to emphasize is just this: when the author of Genesis I sat down and put the story to pen, he consciously chose words, phrases, and form such that he could express a numerology corresponding to the higher meanings he meant to convey - in this case the completeness and finality of God’s creative work in Genesis I.
You can read more this fascinating subject at this link.