Numerology refers to any of many systems, traditions or beliefs in a mystical or esoteric relationship between numbers and physical objects or living things.
Numerology and numerological divination were popular among early mathematicians, such as Pythagoras, but are no longer considered part of mathematics and are regarded as pseudomathematics by most scientists.
Today, numerology is often associated with the occult, alongside astrology and similar divinatory arts. The term can also be used for those who, in the view of some observers, place excess faith in numerical patterns, even if those people don't practice traditional numerology.
Numerologists often reduce a number or word by a process known as digit summing, then reach conclusions based on the single digit that is produced.
Digit summing, as the name implies, involves taking the sum of all of the digits in a number, and repeating the process as necessary until a single-digit answer is produced.
For a word, the values corresponding to each letter's place in the alphabet (e.g., A=1, B=2, through Z=26) are summed.
3,489 -> 3 + 4 + 8 + 9 = 24 -> 2 + 4 = 6
Hello -> 8 + 5 + 12 + 12 + 15 = 52 -> 5 + 2 = 7