900
The Saab 900 was built around what happens in a crash.
Where 900 fits
Why 900 is special
Its long crumple zone and wraparound windscreen came from the company's aviation background, at a time when most manufacturers treated safety as an option list.
900 is part of
Factors & digit properties
- Divisors (27)
- 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 25, 30, 36, 45, 50, 60, 75, 90, 100, 150, 180, 225, 300, 450, 900
- Prime factorisation
- 2^2 × 3^2 × 5^2
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 900
- Scientific notation
- 9.000 × 10^2
Roman numerals
C M
CM uses the subtractive pair CM: a hundred before a thousand — a thousand minus a hundred.
Binary
1 1 1 0 0 0 0 1 0 0
1 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 900
Octal
1 6 0 4
1 × 512 + 6 × 64 + 0 × 8 + 4 × 1 = 900
Hexadecimal
3 8 4
3 × 256 + 8 × 16 + 4 × 1 = 900
Read as powers of two: 512 + 256 + 128 + 4 = 900.
In historical numeral systems
Egyptian
9 coils of rope
9 × 100 = 900. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 5 vertical wedges (sixties place), empty units place
15 × 60 + 0 = 900. Places are separated by a space on the tablet, with the higher place written first. The second place is empty, and this is precisely the case the early system could not write unambiguously — the same wedges alone would also read as 1.
Greek (Ionic)
sampi, marked as a numeral
sampi + keraia
A single letter, sampi, marked with a keraia to show it is a number rather than a word.
Hebrew numerals
tav, then tav, then qof
tav-tav-qof
tav (400) + tav (400) + qof (100) = 900, written in descending order.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Abundant number
- Powerful number
- Harshad (Niven) number
Related numbers & connections
Both were sold on structural safety and longevity at a time when most manufacturers treated safety as an option.
View 240 →Other connections
- is associated with240
why?
Strength 0.50, confidence "high".
Technology & computing
The Saab 900 was produced from 1978 to 1998 with an extended front structure, side impact protection and a curved windscreen intended to improve visibility and structural strength.
DocumentedTechnology & computingGeography: SwedenPeriod: 1978–1998
Common questions
Is 900 a prime number?
No, 900 is not prime.
What are the factors of 900?
The factors of 900 are 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 25, 30, 36, 45, 50, 60, 75, 90, 100, 150, 180, 225, 300, 450, 900.
What is 900 in Roman numerals?
900 in Roman numerals is CM. CM is subtractive: a hundred before a thousand — a thousand minus a hundred. Written additively it would be DCCCC, which Roman inscriptions used freely — the strict subtractive form is a later convention.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026