Your Personality Number is calculated from the consonants in your birth name. It represents the outer you — the face you present to the world and how others instinctively perceive you.
The Personality Number uses only consonants from your birth name — these are the harder, more external sounds that represent the outer layer of your personality.
While your Soul Urge represents your inner world, the Personality Number is the mask you wear in public — your social persona and the qualities you express outwardly.