1787
1787 is the year the United States Constitution was drafted.
- Odd
- Prime
Where 1787 fits
Why 1787 is special
It was written in a closed session over four months by delegates sent to amend a different document. It is the oldest written national constitution still in force, and has been amended 27 times in 238 years.
Same number, different meanings
How 1787 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It was written in a closed session over four months by delegates sent to amend a different document. It is the oldest written national constitution still in force, and has been amended 27 times in 238 years.
- History
In 1787, the United States Constitution was drafted at Philadelphia (North America).
- Law & regulation
The 1787 convention was convened to revise the Articles of Confederation and instead replaced them entirely, in closed session. The resulting document is the oldest national constitution still operating, which is partly a function of how hard it made its own amendment.
1787 is part of
Factors & digit properties
- Divisors (2)
- 1, 1787
- Prime factorisation
- 1787
- Digit sum
- 23
- Digital root
- 5
Representations
- Decimal
- 1787
- Scientific notation
- 1.787 × 10^3
Roman numerals
M D C C L X X X V I I
Binary
1 1 0 1 1 1 1 1 0 1 1
1 × 1,024 + 1 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 1,787
Octal
3 3 7 3
3 × 512 + 3 × 64 + 7 × 8 + 3 × 1 = 1,787
Hexadecimal
6 f b
6 × 256 + f × 16 + b × 1 = 1,787
Read as powers of two: 1,024 + 512 + 128 + 64 + 32 + 16 + 8 + 2 + 1 = 1,787.
In historical numeral systems
Egyptian
1 lotus, 7 coils of rope, 8 hobbles, 7 strokes
1 × 1,000 + 7 × 100 + 8 × 10 + 7 × 1 = 1,787. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 9 vertical wedges (sixties place), 4 corner wedges + 7 vertical wedges (units place)
29 × 60 + 47 = 1787. 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
- Twin prime
Related numbers & connections
1787 is a year in the 18th century, in the 1780s.
The Bill of Rights was ratified in 1791 because several states would not accept the 1787 Constitution without written guarantees.
View 1791 →History
In 1787, the United States Constitution was drafted at Philadelphia (North America).
DocumentedHistoryGeography: North AmericaPeriod: 1787
Law & regulation
The 1787 convention was convened to revise the Articles of Confederation and instead replaced them entirely, in closed session. The resulting document is the oldest national constitution still operating, which is partly a function of how hard it made its own amendment.
DocumentedLaw & regulationGeography: United StatesPeriod: 1787
Common questions
Is 1787 a prime number?
Yes, 1787 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1787?
The factors of 1787 are 1, 1787.
What is 1787 in Roman numerals?
1787 in Roman numerals is MDCCLXXXVII.
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