|Cardinal||nine thousand nine hundred ninety-nine|
(nine thousand nine hundred ninety-ninth)
|Factorization||32× 11 × 101|
|Roman numeral||MXCMXCIX or IXCMXCIX|
9999 can be used as a divisor to generate 4-digit decimal recurrences. For example, 1234 / 9999 = 0.123412341234... .
9999 is an auspicious number in Chinese folklore. Many estimations of the rooms contained the Forbidden City point to 9,999. Chinese tomb contracts often involved being buried with 9999 coins, relational notion to Joss paper, as it was believed the dead would need that amount to buy the burial plot from the Earth goddess.
- "Sloane's A006886 : Kaprekar numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-03.
- Valerie Hansen, Negotiating Daily Life in Traditional China: How Ordinary People Used Contracts, 600-1400 (Yale University Press, 1995)
- Ordman, Edward (January 1983), "Writing Transportable BASIC Part 1", COMPUTE! (32): 26
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