1,000
1000 is the value of the 'kilo-' prefix in the SI system of units — a kilogram is 1000 grams, a kilometre is 1000 metres — and is informally called 'a grand' in English-speaking currency slang.
Where 1,000 fits
Why 1,000 is special
1000's role as the SI system's basic scaling factor (via the 'kilo-' prefix) makes it the everyday bridge between base units and their most commonly used multiples — a kilogram and a kilometre both trace back to 1000. In slang, 'a grand' has meant $1,000 or £1,000 in English since at least the early 20th century.
Same number, different meanings
How 1,000 is understood across different contexts — never implying one meaning because of another.
- Mathematics
1000's role as the SI system's basic scaling factor (via the 'kilo-' prefix) makes it the everyday bridge between base units and their most commonly used multiples — a kilogram and a kilometre both trace back to 1000. In slang, 'a grand' has meant $1,000 or £1,000 in English since at least the early 20th century.
- Everyday life
'A grand' is a long-standing English-language slang term for exactly 1000 units of currency (dollars, pounds, or otherwise), in use since at least the early 20th century.
- Science
The SI prefix 'kilo-' means ×1000 — a kilogram is 1000 grams and a kilometre is 1000 metres — making 1000 the foundational scaling factor for the International System of Units' most commonly used multiples.
1,000 is part of
Factors & digit properties
- Divisors (16)
- 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 1000
- Prime factorisation
- 2^3 × 5^3
- Digit sum
- 1
- Digital root
- 1
Representations
- Decimal
- 1000
- Binary
- 1111101000
- Octal
- 1750
- Hexadecimal
- 3e8
- Roman numeral
- M
- Scientific notation
- 1.000 × 10^3
Other mathematical patterns
- Abundant number
- Happy number
- Powerful number
- Harshad (Niven) number
Related numbers & connections
1000 is the cube of 10 (10³ = 1000).
View 10 →5280 feet to a statute mile contrasts directly with 1000 metres to a kilometre — the same kind of unit (a long distance measure) built on a deliberately round metric factor versus an inherited imperial one.
View 5280 →Everyday life
'A grand' is a long-standing English-language slang term for exactly 1000 units of currency (dollars, pounds, or otherwise), in use since at least the early 20th century.
Widely documentedEveryday life
Science
The SI prefix 'kilo-' means ×1000 — a kilogram is 1000 grams and a kilometre is 1000 metres — making 1000 the foundational scaling factor for the International System of Units' most commonly used multiples.
DocumentedScience
Common questions
Is 1,000 a prime number?
No, 1,000 is not prime.
What are the factors of 1,000?
The factors of 1,000 are 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 1000.
What is 1,000 in Roman numerals?
1,000 in Roman numerals is M.
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: 30 July 2026