1646
1646 is the year Thomas Browne published Pseudodoxia Epidemica.
- Even
- Composite
Where 1646 fits
Why 1646 is special
It systematically examined popular beliefs and tested which were false — an early exercise in debunking that treated common error as a subject worth studying.
Same number, different meanings
How 1646 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It systematically examined popular beliefs and tested which were false — an early exercise in debunking that treated common error as a subject worth studying.
- History
In 1646, Thomas Browne's Pseudodoxia Epidemica set out to test common beliefs against evidence, an early exercise in debunking (England).
- Science
Browne's 1646 work catalogued and tested widely held beliefs, from whether elephants have knees to whether Jews smell different. Treating popular error as an object of inquiry was novel.
1646 is part of
Factors & digit properties
- Divisors (4)
- 1, 2, 823, 1646
- Prime factorisation
- 2 × 823
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 1646
- Scientific notation
- 1.646 × 10^3
Roman numerals
M D C X L V I
MDCXLVI uses the subtractive pair XL: ten before fifty — fifty minus ten.
Binary
1 1 0 0 1 1 0 1 1 1 0
1 × 1,024 + 1 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 1 × 2 + 0 × 1 = 1,646
Octal
3 1 5 6
3 × 512 + 1 × 64 + 5 × 8 + 6 × 1 = 1,646
Hexadecimal
6 6 e
6 × 256 + 6 × 16 + e × 1 = 1,646
Read as powers of two: 1,024 + 512 + 64 + 32 + 8 + 4 + 2 = 1,646.
In historical numeral systems
Egyptian
1 lotus, 6 coils of rope, 4 hobbles, 6 strokes
1 × 1,000 + 6 × 100 + 4 × 10 + 6 × 1 = 1,646. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 7 vertical wedges (sixties place), 2 corner wedges + 6 vertical wedges (units place)
27 × 60 + 26 = 1646. 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
- Semiprime
Related numbers & connections
1646 is a year in the 17th century, in the 1640s.
Browne's 1646 study of common errors and the Royal Society's founding motto — take nobody's word for it — express the same shift from authority to verification.
View 1662 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- is associated with1662
why?
Strength 0.50, confidence "high".
History
In 1646, Thomas Browne's Pseudodoxia Epidemica set out to test common beliefs against evidence, an early exercise in debunking (England).
DocumentedHistoryGeography: EnglandPeriod: 1646
Science
Browne's 1646 work catalogued and tested widely held beliefs, from whether elephants have knees to whether Jews smell different. Treating popular error as an object of inquiry was novel.
DocumentedScienceGeography: EnglandPeriod: 1646
Common questions
Is 1646 a prime number?
No, 1646 is not prime.
What are the factors of 1646?
The factors of 1646 are 1, 2, 823, 1646.
What is 1646 in Roman numerals?
1646 in Roman numerals is MDCXLVI. XL is subtractive: ten before fifty — fifty minus ten. Written additively it would be MDCXXXXVI, 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