八 (bā) promises prosperity through its sound link to 发 (fā) 'to prosper'. 九 (jiǔ) grants longevity via 久 (jiǔ) 'forever'. 二 (èr) reminds: 好事成双 — good things come in pairs. Five unites Wu Xing elements at the center of existence.
History
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Western numerology
The 8 establishes material foundation, 9 brings wisdom of completed cycles, 2 creates balance through partnership, while 5 opens paths to change. Root 6 transforms this into care for loved ones and pursuit of harmony.