1906
1906 is the year of the San Francisco earthquake and fire.
- Even
- Composite
Where 1906 fits
Why 1906 is special
Most of the destruction was fire rather than shaking, and much of that was worsened by dynamiting buildings to make firebreaks. Insurance claims were paid on fire rather than earthquake damage, which shaped how losses were recorded.
Factors & digit properties
- Divisors (4)
- 1, 2, 953, 1906
- Prime factorisation
- 2 × 953
- Digit sum
- 16
- Digital root
- 7
Representations
- Decimal
- 1906
- Binary
- 11101110010
- Octal
- 3562
- Hexadecimal
- 772
- Roman numeral
- MCMVI
- Scientific notation
- 1.906 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
The San Francisco earthquake of 1906 was mostly recorded as fire because fire was insured and earthquake was not; the Lisbon earthquake of 1755 produced the first systematic survey. Insurance shaped one record and inquiry the other.
View 1755 →Other connections
- contrasts with1755
why?
Strength 0.50, confidence "high".
Science
Around 80 percent of San Francisco's 1906 destruction was fire. Earthquake damage was frequently uninsured while fire was covered, so property owners had a direct incentive to report fire — which distorted the loss record for decades.
DocumentedScienceGeography: California, United StatesPeriod: 1906
Common questions
Is 1906 a prime number?
No, 1906 is not prime.
What are the factors of 1906?
The factors of 1906 are 1, 2, 953, 1906.
What is 1906 in Roman numerals?
1906 in Roman numerals is MCMVI.
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