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.
Factors & digit properties
- Divisors (4)
- 1, 2, 809, 1618
- Prime factorisation
- 2 × 809
- Digit sum
- 16
- Digital root
- 7
Representations
- Decimal
- 1618
- Binary
- 11001010010
- Octal
- 3122
- Hexadecimal
- 652
- Roman numeral
- MDCXVIII
- Scientific notation
- 1.618 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
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 →Other connections
- developed from1555
why?
Strength 0.50, confidence "high".
History
The 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: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026