Numerology compatibility by your base number Base 1. This base number is often attracted to other 1s, as well 4s and 7s. ... Base 3. Base number 3 is compatible with almost all the base numbers, including 1, 2, 3, 4, 6, 7, and 9. ... Base 5. In romantic relationships, 5s are most compatible with 1, 3, 5, and 9. Oct 9, 2021