1556
1556 is the year of the deadliest earthquake in recorded history.
- Even
- Composite
Where 1556 fits
Why 1556 is special
The Shaanxi earthquake killed an estimated 830,000 people, many in cave dwellings cut into loess cliffs that collapsed. The dwelling type is what made the toll so high.
Factors & digit properties
- Divisors (6)
- 1, 2, 4, 389, 778, 1556
- Prime factorisation
- 2^2 × 389
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 1556
- Binary
- 11000010100
- Octal
- 3024
- Hexadecimal
- 614
- Roman numeral
- MDLVI
- Scientific notation
- 1.556 × 10^3
Other mathematical patterns
- Deficient number
Related numbers & connections
The Shaanxi earthquake of 1556 remains the deadliest recorded, and the Lisbon earthquake of 1755 produced the first systematic scientific survey of one. Casualties and scientific consequence are unrelated.
View 1755 →Other connections
- contrasts with1755
why?
Strength 0.50, confidence "high".
Science
The 1556 Shaanxi earthquake remains the deadliest recorded, with an estimated 830,000 deaths. Loess cave dwellings, comfortable and cheap, collapsed catastrophically — a building-practice failure as much as a seismic one.
DocumentedScienceGeography: ChinaPeriod: 1556
Common questions
Is 1556 a prime number?
No, 1556 is not prime.
What are the factors of 1556?
The factors of 1556 are 1, 2, 4, 389, 778, 1556.
What is 1556 in Roman numerals?
1556 in Roman numerals is MDLVI.
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