1808
1808 is the year the Atlantic slave trade became illegal in the United States.
- Even
- Composite
Where 1808 fits
Why 1808 is special
Congress prohibited importation from the earliest date the Constitution allowed. Domestic slavery and internal trading continued and expanded for another fifty-seven years.
1808 connects to:
- historical years — appears in
- 1807 — contrasts with
Same number, different meanings
How 1808 is understood across different contexts — never implying one meaning because of another.
- Mathematics
Congress prohibited importation from the earliest date the Constitution allowed. Domestic slavery and internal trading continued and expanded for another fifty-seven years.
- History
In 1808, the United States prohibited the importation of enslaved people, the earliest date the Constitution had permitted (United States).
- Law & regulation
The US Constitution barred Congress from prohibiting the slave trade before 1808, and the prohibition took effect on the first day it could. The internal trade grew substantially afterwards, so the ban changed the source rather than the institution.
1808 is part of
Factors & digit properties
- Divisors (10)
- 1, 2, 4, 8, 16, 113, 226, 452, 904, 1808
- Prime factorisation
- 2^4 × 113
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 1808
- Scientific notation
- 1.808 × 10^3
Roman numerals
M D C C C V I I I
Binary
1 1 1 0 0 0 1 0 0 0 0
1 × 1,024 + 1 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 1,808
Octal
3 4 2 0
3 × 512 + 4 × 64 + 2 × 8 + 0 × 1 = 1,808
Hexadecimal
7 1 0
7 × 256 + 1 × 16 + 0 × 1 = 1,808
Read as powers of two: 1,024 + 512 + 256 + 16 = 1,808.
In historical numeral systems
Egyptian
1 lotus, 8 coils of rope, 8 strokes
1 × 1,000 + 8 × 100 + 8 × 1 = 1,808. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 corner wedges (sixties place), 8 vertical wedges (units place)
30 × 60 + 8 = 1808. 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
- Happy number
Related numbers & connections
1808 is a year in the 19th century, in the 1800s.
Britain banned the slave trade in 1807 and the United States prohibited importation from 1808, the earliest date its constitution allowed. Both left slavery itself untouched.
View 1807 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- contrasts with1807
why?
Strength 0.50, confidence "high".
History
In 1808, the United States prohibited the importation of enslaved people, the earliest date the Constitution had permitted (United States).
DocumentedHistoryGeography: United StatesPeriod: 1808
Law & regulation
The US Constitution barred Congress from prohibiting the slave trade before 1808, and the prohibition took effect on the first day it could. The internal trade grew substantially afterwards, so the ban changed the source rather than the institution.
DocumentedLaw & regulationGeography: United StatesPeriod: 1808
Common questions
Is 1808 a prime number?
No, 1808 is not prime.
What are the factors of 1808?
The factors of 1808 are 1, 2, 4, 8, 16, 113, 226, 452, 904, 1808.
What is 1808 in Roman numerals?
1808 in Roman numerals is MDCCCVIII.
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