1987 (number)

← 1986 1987 1988 →
Cardinalone thousand nine hundred eighty-seven
Ordinal1987th
(one thousand nine hundred eighty-seventh)
Factorizationprime
Prime300th
Greek numeral,ΑϠΠΖ´
Roman numeralMCMLXXXVII, mcmlxxxvii
Binary111110000112
Ternary22011213
Senary131116
Octal37038
Duodecimal119712
Hexadecimal7C316

1987 (one thousand nine hundred [and] eighty-seven) is the natural number following 1986 and preceding 1988.

In mathematics

1987 is an odd number and the 300th prime number.[1] It is the first number of a sexy prime triplet (1987, 1993, 1999). Being of the form 4n + 3, it is a Gaussian prime. It is a lucky number and therefore also a lucky prime.[2] 1987 is a prime factor of the 9th number in Sylvester's sequence, and is the 15th prime to divide any number in the sequence.

References

  1. ↑ Vanovschi, Vitalii. "Properties of the number 1987". www.numberempire.com. Retrieved 2026-08-22.
  2. ↑ Sloane, N. J. A. (ed.). "Sequence A031157 (Numbers that are both lucky and prime)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2026-08-22.


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