← 9998 9999 10000 →
Cardinalnine thousand nine hundred ninety-nine
Ordinal9999th
(nine thousand nine hundred ninety-ninth)
Factorization32 × 11 × 101
Greek numeral,ΘϠϞΘ´
Roman numeralMXCMXCIX, or IXCMXCIX
Binary100111000011112
Ternary1112011003
Senary1141436
Octal234178
Duodecimal595312
Hexadecimal270F16

9999 is the natural number following 9998 and preceding 10000.

9999 is an auspicious number in Chinese folklore. Many estimations of the rooms contained in the Forbidden City point to 9999. Chinese tomb contracts often involved being buried with 9999 coins, a practice related 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]

Mathematics

9999 can be used as a divisor to generate 4-digit decimal recurrences. For example, 1234 / 9999 = 0.123412341234... .

9999 is a Kaprekar number.[3]

Computer and software

9999 was the last possible line number in some older programming languages such as BASIC.[4] Often the line "9999 END" was the first line written for a new program.

Some very old software used "9999" as end of file, however no problems occurred on September 9, 1999.[5]

Videogames

The King of Fighters character K9999 has the number on his name, although it is read as "kay-four-nine".

In Final Fantasy and other RPGs, 9999 is often the maximum damage or healing number the game is allowed to calculate.

References

  1. ^ Valerie Hansen, Negotiating Daily Life in Traditional China: How Ordinary People Used Contracts, 600-1400 (Yale University Press, 1995)
  2. ^ http://www.rop.gov.om/english/regionalinfo.asp Archived 2012-08-25 at the Wayback Machine
  3. ^ "Sloane's A006886 : Kaprekar numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-03.
  4. ^ Ordman, Edward (January 1983), "Writing Transportable BASIC Part 1", Compute! (32): 26
  5. ^ Alfred, Randy (9 September 2011). "Sept. 9, 1999: 9/9/99 No Big Deal for Computers". Wired. Wired. Archived from the original on 1 June 2014. Retrieved 19 November 2017. Conversely, at least one expert worried that the real problem wasn't in the date being interpreted as an end-of-file marker (or trailer), but in an end-of-file marker being interpreted as a date.


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