1889
1889 is the year the Eiffel Tower was completed.
- Odd
- Prime
Where 1889 fits
Why 1889 is special
It was built as a temporary entrance arch for the World's Fair and was due for demolition after twenty years. It survived because it proved useful as a radio antenna, which is a reminder that permanence is often accidental.
Same number, different meanings
How 1889 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It was built as a temporary entrance arch for the World's Fair and was due for demolition after twenty years. It survived because it proved useful as a radio antenna, which is a reminder that permanence is often accidental.
- History
In 1889, the Eiffel Tower opened for the Paris Exposition (France).
- Technology & computing
The Eiffel Tower was a temporary entrance arch for the 1889 World's Fair with a twenty-year demolition date. It survived because it made an excellent radio antenna — a reminder that permanence is frequently accidental rather than intended.
1889 is part of
Factors & digit properties
- Divisors (2)
- 1, 1889
- Prime factorisation
- 1889
- Digit sum
- 26
- Digital root
- 8
Representations
- Decimal
- 1889
- Scientific notation
- 1.889 × 10^3
Roman numerals
M D C C C L X X X I X
MDCCCLXXXIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 1 1 0 1 1 0 0 0 0 1
1 × 1,024 + 1 × 512 + 1 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 1,889
Octal
3 5 4 1
3 × 512 + 5 × 64 + 4 × 8 + 1 × 1 = 1,889
Hexadecimal
7 6 1
7 × 256 + 6 × 16 + 1 × 1 = 1,889
Read as powers of two: 1,024 + 512 + 256 + 64 + 32 + 1 = 1,889.
In historical numeral systems
Egyptian
1 lotus, 8 coils of rope, 8 hobbles, 9 strokes
1 × 1,000 + 8 × 100 + 8 × 10 + 9 × 1 = 1,889. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 corner wedges + 1 vertical wedge (sixties place), 2 corner wedges + 9 vertical wedges (units place)
31 × 60 + 29 = 1889. 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
- Sophie Germain prime
Related numbers & connections
1889 is a year in the 19th century, in the 1880s.
The Great Pyramid was the tallest structure on Earth for about 3,800 years, until the nineteenth century. The Eiffel Tower of 1889 is among the structures that finally exceeded it.
View 2560 →History
In 1889, the Eiffel Tower opened for the Paris Exposition (France).
DocumentedHistoryGeography: FrancePeriod: 1889
Technology & computing
The Eiffel Tower was a temporary entrance arch for the 1889 World's Fair with a twenty-year demolition date. It survived because it made an excellent radio antenna — a reminder that permanence is frequently accidental rather than intended.
DocumentedTechnology & computingGeography: FrancePeriod: 1889
Common questions
Is 1889 a prime number?
Yes, 1889 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1889?
The factors of 1889 are 1, 1889.
What is 1889 in Roman numerals?
1889 in Roman numerals is MDCCCLXXXIX. IX is subtractive: one before ten — ten minus one. Written additively it would be MDCCCLXXXVIIII, 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: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026