1720
1720 is the year of the South Sea Bubble.
- Even
- Composite
Where 1720 fits
Why 1720 is special
A company with no meaningful trade drove its own share price up tenfold and collapsed. Isaac Newton lost a large sum and is said to have remarked that he could calculate the motions of heavenly bodies but not the madness of people.
Factors & digit properties
- Divisors (16)
- 1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720
- Prime factorisation
- 2^3 × 5 × 43
- Digit sum
- 10
- Digital root
- 1
Representations
- Decimal
- 1720
- Binary
- 11010111000
- Octal
- 3270
- Hexadecimal
- 6b8
- Roman numeral
- MDCCXX
- Scientific notation
- 1.720 × 10^3
Other mathematical patterns
- Abundant number
- Harshad (Niven) number
Related numbers & connections
The South Sea Bubble and tulip mania are the two standard historical bubbles. Modern research suggests the tulip episode was far smaller than its reputation, while the South Sea collapse was genuinely severe.
View 1637 →Finance & economics
The South Sea Company's business was assuming government debt, not trading. Its share price rose roughly tenfold on expectation alone and collapsed within months, taking down investors including Newton.
DocumentedFinance & economicsGeography: BritainPeriod: 1720
Common questions
Is 1720 a prime number?
No, 1720 is not prime.
What are the factors of 1720?
The factors of 1720 are 1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720.
What is 1720 in Roman numerals?
1720 in Roman numerals is MDCCXX.
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