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Cardinal | nine thousand nine hundred ninety-nine | |||

Ordinal | 9999th (nine thousand nine hundred and ninety-ninth) | |||

Factorization | 3^{2}× 11 × 101 | |||

Roman numeral | MXCMXCIX or IXCMXCIX | |||

Binary | 10011100001111_{2} | |||

Ternary | 111201100_{3} | |||

Quaternary | 2130033_{4} | |||

Quinary | 304444_{5} | |||

Senary | 114143_{6} | |||

Octal | 23417_{8} | |||

Duodecimal | 5953_{12} | |||

Hexadecimal | 270F_{16} | |||

Vigesimal | 14JJ_{20} | |||

Base 36 | 7PR_{36} |

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Cardinal | nine thousand nine hundred ninety-nine | |||

Ordinal | 9999th (nine thousand nine hundred and ninety-ninth) | |||

Factorization | 3^{2}× 11 × 101 | |||

Roman numeral | MXCMXCIX or IXCMXCIX | |||

Binary | 10011100001111_{2} | |||

Ternary | 111201100_{3} | |||

Quaternary | 2130033_{4} | |||

Quinary | 304444_{5} | |||

Senary | 114143_{6} | |||

Octal | 23417_{8} | |||

Duodecimal | 5953_{12} | |||

Hexadecimal | 270F_{16} | |||

Vigesimal | 14JJ_{20} | |||

Base 36 | 7PR_{36} |

**Nine thousand nine-hundred ninety-nine** (**9999**) is the natural number following 9998 and preceding 10000.

9999 is a Kaprekar number.

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.^{[1]}

9999 is also the emergency telephone number in Oman.^{[2]}

9999 was the last possible line number in some older programming languages such as BASIC.^{[3]} Often the line "9999 END" was the first line written for a new program.

The King of Fighters character K9999 has the number on his name, although it is read as "Kay-Four-Nine" /ˈkeɪfɔərnaɪn/

**^**Valerie Hansen,*Negotiating Daily Life in Traditional China: How Ordinary People Used Contracts, 600-1400*(Yale University Press, 1995)**^**(http://www.rop.gov.om/english/regionalinfo.asp)**^**Ordman, Edward (January 1983), "Writing Transportable BASIC Part 1",*COMPUTE!*(32): 26

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