9000 (nine thousand) is the natural number following 8999 and preceding 9001.
| Cardinal | 9000 nine thousand |
| Ordinal | 9000th nine thousandth |
| Factorization |  |
| Roman numeral | MX or IX |
| Roman numeral (Unicode) | MX, mx, Ⅸ, ⅸ |
| Binary | 10001100101000 |
| Octal | 21450 |
| Duodecimal | 5260 |
| Hexadecimal | 2328 |
In other fields
- ISO 9000 is the ISO's standard for Quality Management System in production environments. This includes ISO 9001-9004.
Selected numbers in the range 9000–9999
- 9009 - centered cube number
- 9025 - 952, centered octagonal number
- 9029 - Sophie Germain prime
- 9045 - triangular number
- 9059 - Sophie Germain prime
- 9072 - decagonal number
- 9077 - Markov number
- 9091 - unique prime
- 9126 - pentagonal pyramidal number
- 9139 - tetrahedral number
- 9180 - triangular number
- 9216 - 962
- 9221 - Sophie Germain prime
- 9224 - octahedral number
- 9241 - cuban prime of the form x = y + 1
- 9272 - weird number
- 9283 - centered heptagonal number
- 9293 - Sophie Germain prime
- 9316 - triangular number
- 9334 - nonagonal number
- 9349 - Lucas prime
- 9371 - Sophie Germain prime
- 9397 - balanced prime
- 9409 - 972, centered octagonal number
- 9419 - Sophie Germain prime
- 9453 - triangular number
- 9455 - square pyramidal number
- 9457 - decagonal number
- 9467 - safe prime
- 9473 - Sophie Germain prime, balanced prime
- 9479 - Sophie Germain prime
- 9539 - Sophie Germain prime
- 9587 - safe prime
- 9591 - triangular number
- 9604 - 982
- 9629 - Sophie Germain prime
- 9647 - centered heptagonal number
- 9660 - ISO 9660 standard for CD-ROM file system
- 9689 - Sophie Germain prime
- 9699 - nonagonal number
- 9730 - triangular number
- 9743 - safe prime
- 9791 - Sophie Germain prime
- 9800 - member of a Ruth-Aaron pair (first definition) with 9801
- 9801 - 992, centered octagonal number, member of a Ruth-Aaron pair (first definition) with 9800
- 9839 - safe prime
- 9850 - decagonal number
- 9855 - magic constant of n × n normal magic square and n-Queens Problem for n = 27.
- 9870 - triangular number
- 9871 - balanced prime
- 9880 - tetrahedral number
- 9887 - safe prime
- 9899 - ISO 9899 standard for C programming language
- 9901 - unique prime
- 9923 - probably smallest certainly executable prime number on x86 MS-DOS [1]
- 9999 - Kaprekar number
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