1722
1722 is the year Easter Island was first visited by Europeans.
- Even
- Composite
Where 1722 fits
Why 1722 is special
It was reached on Easter Sunday, which is where the name comes from. The society that raised the statues had already collapsed, and why is still argued.
Same number, different meanings
How 1722 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It was reached on Easter Sunday, which is where the name comes from. The society that raised the statues had already collapsed, and why is still argued.
- History
In 1722, a Dutch expedition reached Easter Island on Easter Sunday, which is how it acquired its European name (Pacific).
- Geography
Roggeveen reached the island on Easter Sunday 1722. The moai were already standing and the society that made them was much reduced, with deforestation, introduced rats and later slave raids all argued as causes.
1722 is part of
Factors & digit properties
- Divisors (16)
- 1, 2, 3, 6, 7, 14, 21, 41, 42, 82, 123, 246, 287, 574, 861, 1722
- Prime factorisation
- 2 × 3 × 7 × 41
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 1722
- Scientific notation
- 1.722 × 10^3
Roman numerals
M D C C X X I I
Binary
1 1 0 1 0 1 1 1 0 1 0
1 × 1,024 + 1 × 512 + 0 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 0 × 1 = 1,722
Octal
3 2 7 2
3 × 512 + 2 × 64 + 7 × 8 + 2 × 1 = 1,722
Hexadecimal
6 b a
6 × 256 + b × 16 + a × 1 = 1,722
Read as powers of two: 1,024 + 512 + 128 + 32 + 16 + 8 + 2 = 1,722.
In historical numeral systems
Egyptian
1 lotus, 7 coils of rope, 2 hobbles, 2 strokes
1 × 1,000 + 7 × 100 + 2 × 10 + 2 × 1 = 1,722. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 8 vertical wedges (sixties place), 4 corner wedges + 2 vertical wedges (units place)
28 × 60 + 42 = 1722. 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
- Abundant number
Related numbers & connections
1722 is a year in the 18th century, in the 1720s.
The Batavia wreck of 1629 and the European sighting of Easter Island in 1722 are both events documented only because Dutch trading companies kept records of them.
View 1629 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- is associated with1629
why?
Strength 0.50, confidence "high".
History
In 1722, a Dutch expedition reached Easter Island on Easter Sunday, which is how it acquired its European name (Pacific).
DocumentedHistoryGeography: PacificPeriod: 1722
Geography
Roggeveen reached the island on Easter Sunday 1722. The moai were already standing and the society that made them was much reduced, with deforestation, introduced rats and later slave raids all argued as causes.
DocumentedGeographyGeography: Rapa NuiPeriod: 1722
Common questions
Is 1722 a prime number?
No, 1722 is not prime.
What are the factors of 1722?
The factors of 1722 are 1, 2, 3, 6, 7, 14, 21, 41, 42, 82, 123, 246, 287, 574, 861, 1722.
What is 1722 in Roman numerals?
1722 in Roman numerals is MDCCXXII.
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