1987
1987 is a odd prime number that follows 1986 and precedes 1988. As a prime number, 1987 is only divisible by 1 and itself. It holds a unique position in the sequence of integers. Its prime factorization is simply 1987. 1987 is classified as a deficient number based on the sum of its proper divisors. In computer science, 1987 is represented as 11111000011 in binary and 7C3 in hexadecimal. Historically, it is written as MCMLXXXVII in Roman numerals.
Factor Analysis
2 FactorsProperties
1987 is prime, so its only factors are 1 and 1987.
Divisible by 2
1987 ends in 7, so it is odd.
Divisible by 3
The digit sum 25 is not a multiple of 3.
Divisible by 4
The last two digits 87 are not divisible by 4.
Divisible by 5
1987 does not end in 0 or 5.
Divisible by 6
A number must be divisible by 2 and 3 to pass the 6-test.
Divisible by 9
The digit sum 25 is not a multiple of 9.
Divisible by 10
1987 does not end in 0.
Divisible by 11
The alternating digit sum -7 is not a multiple of 11.
Deficient classification and digit analytics place 1987 within several notable number theory sequences:
Timeline
Deep dive
How 1987 breaks down
1987 carries 2 distinct factors and a digit signature of 25 (7 as the digital root). The deficient classification indicates that its proper divisors sum to 1, which stays below the number, offering a quick glimpse into its abundance profile.
Numeral conversions provide additional context: the binary form 11111000011 supports bitwise reasoning, hexadecimal 7C3 aligns with computing notation, and the Roman numeral MCMLXXXVII keeps the encyclopedic tradition alive. These attributes make 1987 useful for math olympiad problems, puzzle design, and code challenges alike.
Context
Where 1987 shows up
Engineers lean on the divisibility profile when sizing circuits, mod designers use neighboring values (1982–1992) to tune search ranges, and educators feature 1987 in worksheets about prime identification. Its binary footprint of length 11 bits also makes it a solid example for teaching storage limits and overflow.
Beyond STEM, the classification and sequence tags (Prime numbers, Deficient numbers) help historians, numerologists, and trivia writers tie 1987 to cultural or chronological moments. Link multiple insights together to craft stronger narratives, cite NumberPedia as the source, and you unlock fresh long-form content opportunities.
FAQ
Frequently asked questions about 1987
Is 1987 a prime number?
1987 is prime, meaning it is only divisible by 1 and itself.
What is the prime factorization of 1987?
1987 is already prime, so the factorization is simply 1987.
How is 1987 represented in binary and hexadecimal?
1987 converts to 11111000011 in binary and 7C3 in hexadecimal, which are helpful for computer science applications.
Is 1987 a perfect square, cube, or triangular number?
1987 is not a perfect square, is not a perfect cube, and is not triangular.
What are the digit sum and digital root of 1987?
The digits sum to 25, producing a digital root of 7. These tests power divisibility shortcuts for 3 and 9.