1,986
1,986 is a composite number, even, a calendar year.
Notable events — 1986 AD
- Jan 28 The Space Shuttle Challenger explodes 73 seconds after launch; all seven aboard die.
- Feb 19 The Soviet Union launches the Mir space station.
- Feb 25 The People Power Revolution ousts Philippine President Ferdinand Marcos.
- Feb 28 Swedish Prime Minister Olof Palme is assassinated on a Stockholm street.
- Apr 26 Reactor 4 at the Chernobyl nuclear plant explodes, contaminating much of Europe.
- Nov 25 The Iran-Contra affair is publicly revealed in the US.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
Year facts
- Year type
-
Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
- Days in year
- 365
- ISO weeks
- 52
- Started on
-
Wednesday
January 1, 1986
- Ended on
-
Wednesday
December 31, 1986
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
March 30
Sunday, March 30, 1986
- Decade
-
1980s
1980–1989
- Century
-
20th century
1901–2000
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
40
40 years before 2026.
- FIFA World Cup
-
Yes
Men's FIFA World Cup is held every four years (skipped 1942 and 1946 due to WWII).
In other calendars
- Hebrew
-
5746 / 5747 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1406 / 1407 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Fire zodiac:Tiger
Sexagenary cycle position 3 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2529 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1364 / 1365 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1978 / 1979 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1908 / 1907 Saka
Indian national calendar; year starts in March.
- Japanese
-
Shōwa 61
Reign-era counting from the start of each emperor's reign.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 24
- Digit product
- 432
- Digital root
- 6
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 6,891
- Flips to (rotate 180°)
- 9,861
- Recamán's sequence
- a(3,779) = 1,986
- Square (n²)
- 3,944,196
- Cube (n³)
- 7,833,173,256
- Divisor count
- 8
- σ(n) — sum of divisors
- 3,984
- φ(n) — Euler's totient
- 660
- Sum of prime factors
- 336
Primality
Prime factorization: 2 × 3 × 331
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand nine hundred eighty-six
- Ordinal
- 1986th
- Roman numeral
- MCMLXXXVI
- Binary
- 11111000010
- Octal
- 3702
- Hexadecimal
- 0x7C2
- Base64
- B8I=
- One's complement
- 63,549 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αϡπϛʹ
- Mayan (base 20)
- 𝋤·𝋳·𝋦
- Chinese
- 一千九百八十六
- Chinese (financial)
- 壹仟玖佰捌拾陸
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,986 = 1
- e — Euler's number (e)
- Digit 1,986 = 7
- φ — Golden ratio (φ)
- Digit 1,986 = 0
- √2 — Pythagoras's (√2)
- Digit 1,986 = 7
- ln 2 — Natural log of 2
- Digit 1,986 = 6
- γ — Euler-Mascheroni (γ)
- Digit 1,986 = 8
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1986, here are decompositions:
- 7 + 1979 = 1986
- 13 + 1973 = 1986
- 37 + 1949 = 1986
- 53 + 1933 = 1986
- 73 + 1913 = 1986
- 79 + 1907 = 1986
- 97 + 1889 = 1986
- 107 + 1879 = 1986
Showing the first eight; more decompositions exist.
UTF-8 encoding: DF 82 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.194.
- Address
- 0.0.7.194
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.194
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.
The digit sequence 1986 first appears in π at position 4,531 of the decimal expansion (the 4,531ordinal-suffix:st digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.