1005
UN 1005 is anhydrous ammonia.
- Odd
- Composite
Where 1005 fits
Why 1005 is special
It is refrigerant, fertiliser feedstock and acute inhalation hazard at once, which is why its transport is regulated far more tightly than its ubiquity suggests.
Same number, different meanings
How 1005 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It is refrigerant, fertiliser feedstock and acute inhalation hazard at once, which is why its transport is regulated far more tightly than its ubiquity suggests.
- History
In 1005, the Treaty of Chanyuan settled the war between Song China and the Liao, fixing an annual tribute and holding for over a century (China).
- Technology & computing
UN 1005 identifies anhydrous ammonia, a toxic and corrosive gas transported under pressure and used extensively in refrigeration and fertiliser production.
1005 is part of
Factors & digit properties
- Divisors (8)
- 1, 3, 5, 15, 67, 201, 335, 1005
- Prime factorisation
- 3 × 5 × 67
- Digit sum
- 6
- Digital root
- 6
Representations
- Decimal
- 1005
- Scientific notation
- 1.005 × 10^3
Roman numerals
M V
Binary
1 1 1 1 1 0 1 1 0 1
1 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 1,005
Octal
1 7 5 5
1 × 512 + 7 × 64 + 5 × 8 + 5 × 1 = 1,005
Hexadecimal
3 e d
3 × 256 + e × 16 + d × 1 = 1,005
Read as powers of two: 512 + 256 + 128 + 64 + 32 + 8 + 4 + 1 = 1,005.
In historical numeral systems
Egyptian
1 lotus, 5 strokes
1 × 1,000 + 5 × 1 = 1,005. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 6 vertical wedges (sixties place), 4 corner wedges + 5 vertical wedges (units place)
16 × 60 + 45 = 1005. Places are separated by a space on the tablet, with the higher place written first.
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
- Deficient number
Related numbers & connections
1005 is a year in the 11th century, in the 1000s.
Ammonia and chlorine are both toxic gases in everyday industrial use, and both are transported under strict pressurised conditions.
View 1017 →History
In 1005, the Treaty of Chanyuan settled the war between Song China and the Liao, fixing an annual tribute and holding for over a century (China).
DocumentedHistoryGeography: ChinaPeriod: 1005
Technology & computing
UN 1005 identifies anhydrous ammonia, a toxic and corrosive gas transported under pressure and used extensively in refrigeration and fertiliser production.
DocumentedTechnology & computingGeography: International — UN model regulationsPeriod: 1956–
Common questions
Is 1005 a prime number?
No, 1005 is not prime.
What are the factors of 1005?
The factors of 1005 are 1, 3, 5, 15, 67, 201, 335, 1005.
What is 1005 in Roman numerals?
1005 in Roman numerals is MV.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026