1618
1618 is the year the Thirty Years' War began.
- Even
- Composite
Where 1618 fits
Why 1618 is special
It started as a religious conflict in Bohemia and ended as a general European war about power. Some German regions lost a third or more of their population, a proportion not matched again in Europe until the twentieth century.
1618 is part of
Factors & digit properties
- Divisors (4)
- 1, 2, 809, 1618
- Prime factorisation
- 2 × 809
- Digit sum
- 16
- Digital root
- 7
Representations
- Decimal
- 1618
- Scientific notation
- 1.618 × 10^3
Roman numerals
M D C X V I I I
Binary
1 1 0 0 1 0 1 0 0 1 0
1 × 1,024 + 1 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 0 × 1 = 1,618
Octal
3 1 2 2
3 × 512 + 1 × 64 + 2 × 8 + 2 × 1 = 1,618
Hexadecimal
6 5 2
6 × 256 + 5 × 16 + 2 × 1 = 1,618
Read as powers of two: 1,024 + 512 + 64 + 16 + 2 = 1,618.
In historical numeral systems
Egyptian
1 lotus, 6 coils of rope, 1 hobble, 8 strokes
1 × 1,000 + 6 × 100 + 1 × 10 + 8 × 1 = 1,618. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 6 vertical wedges (sixties place), 5 corner wedges + 8 vertical wedges (units place)
26 × 60 + 58 = 1618. 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
1618 is a year in the 17th century, in the 1610s.
The Peace of Augsburg in 1555 settled religion between princes and excluded Calvinism, which is part of why the Thirty Years' War began in 1618.
View 1555 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- developed from1555
why?
Strength 0.50, confidence "high".
History
In 1618, the Thirty Years' War began with the Defenestration of Prague (Central Europe).
DocumentedHistoryGeography: Central EuropePeriod: 1618The war that began in 1618 over Protestant and Catholic authority in Bohemia was, by its end, Catholic France funding Protestant Sweden against Catholic Austria. The transition from confessional to strategic motive is why it ran for thirty years.
DocumentedHistoryGeography: Central EuropePeriod: 1618–1648
Common questions
Is 1618 a prime number?
No, 1618 is not prime.
What are the factors of 1618?
The factors of 1618 are 1, 2, 809, 1618.
What is 1618 in Roman numerals?
1618 in Roman numerals is MDCXVIII.
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