1987
1987 is the year the Montreal Protocol was signed.
- Odd
- Prime
Where 1987 fits
Why 1987 is special
It phased out ozone-depleting chemicals and is the only UN treaty ratified by every member state. The ozone hole is measurably recovering, which makes it the clearest example of an international environmental agreement working.
1987 is part of
Factors & digit properties
- Divisors (2)
- 1, 1987
- Prime factorisation
- 1987
- Digit sum
- 25
- Digital root
- 7
Representations
- Decimal
- 1987
- Binary
- 11111000011
- Octal
- 3703
- Hexadecimal
- 7c3
- Roman numeral
- MCMLXXXVII
- Scientific notation
- 1.987 × 10^3
Other mathematical patterns
- Deficient number
- Lucky number (mathematical sieve)
Related numbers & connections
Smallpox eradication and the Montreal Protocol. Both are cases of coordinated international action achieving a measurable, verifiable result.
View 1980 →The Montreal Protocol bound every state to phase out specific chemicals; the Paris Agreement lets each set its own targets with no enforcement. The first worked measurably and the second achieved universal participation.
View 2015 →Law & regulation
The Montreal Protocol phased out ozone-depleting chemicals and is the only UN treaty ratified by every member state. The ozone hole is measurably recovering, which makes it the clearest evidence that international environmental agreements can work.
DocumentedLaw & regulationGeography: International — every UN member statePeriod: 1987
Common questions
Is 1987 a prime number?
Yes, 1987 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1987?
The factors of 1987 are 1, 1987.
What is 1987 in Roman numerals?
1987 in Roman numerals is MCMLXXXVII.
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