1817
1817 is the year the stethoscope was invented.
- Odd
- Composite
Where 1817 fits
Why 1817 is special
Laennec rolled paper into a tube because he was uncomfortable placing his ear directly on a female patient's chest. Modesty produced the defining instrument of clinical medicine.
Factors & digit properties
- Divisors (4)
- 1, 23, 79, 1817
- Prime factorisation
- 23 × 79
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 1817
- Binary
- 11100011001
- Octal
- 3431
- Hexadecimal
- 719
- Roman numeral
- MDCCCXVII
- Scientific notation
- 1.817 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
The stethoscope of 1817 let physicians hear inside the body, and Koch's identification of the tuberculosis bacterium in 1882 explained much of what they had been listening to.
View 1882 →Other connections
- developed from1882
why?
Strength 0.50, confidence "high".
Science
Laennec devised the stethoscope in 1817 to avoid direct ear-to-chest contact with a female patient. The instrument turned out to hear better than the ear alone, which was not the reason for making it.
DocumentedScienceGeography: FrancePeriod: 1817
Common questions
Is 1817 a prime number?
No, 1817 is not prime.
What are the factors of 1817?
The factors of 1817 are 1, 23, 79, 1817.
What is 1817 in Roman numerals?
1817 in Roman numerals is MDCCCXVII.
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