1,989
1,989 is a composite number, odd, a calendar year.
Notable events — 1989 AD
- Mar 12 Tim Berners-Lee circulates his proposal for what becomes the World Wide Web.
- Mar 24 The Exxon Valdez runs aground in Alaska's Prince William Sound, spilling 11 million gallons of crude oil.
- Jun 4 Chinese troops crush the Tiananmen Square pro-democracy protests.
- Aug 24 Voyager 2 makes its closest approach to Neptune.
- Nov 9 The Berlin Wall falls as East Germany opens its borders.
- Dec 25 Romanian dictator Nicolae Ceaușescu and his wife Elena are executed after a popular revolt.
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
-
Sunday
January 1, 1989
- Ended on
-
Sunday
December 31, 1989
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
March 26
Sunday, March 26, 1989
- Decade
-
1980s
1980–1989
- Century
-
20th century
1901–2000
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
37
37 years before 2026.
In other calendars
- Hebrew
-
5749 / 5750 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1409 / 1410 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Snake
Sexagenary cycle position 6 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2532 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1367 / 1368 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1981 / 1982 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1911 / 1910 Saka
Indian national calendar; year starts in March.
- Japanese
-
Heisei 1
Reign-era counting from the start of each emperor's reign.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 27
- Digit product
- 648
- Digital root
- 9
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 9,891
- Flips to (rotate 180°)
- 6,861
- Recamán's sequence
- a(3,773) = 1,989
- Square (n²)
- 3,956,121
- Cube (n³)
- 7,868,724,669
- Divisor count
- 12
- σ(n) — sum of divisors
- 3,276
- φ(n) — Euler's totient
- 1,152
- Sum of prime factors
- 36
Primality
Prime factorization: 3 2 × 13 × 17
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand nine hundred eighty-nine
- Ordinal
- 1989th
- Roman numeral
- MCMLXXXIX
- Binary
- 11111000101
- Octal
- 3705
- Hexadecimal
- 0x7C5
- Base64
- B8U=
- One's complement
- 63,546 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αϡπθʹ
- Mayan (base 20)
- 𝋤·𝋳·𝋩
- Chinese
- 一千九百八十九
- Chinese (financial)
- 壹仟玖佰捌拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,989 = 9
- e — Euler's number (e)
- Digit 1,989 = 6
- φ — Golden ratio (φ)
- Digit 1,989 = 9
- √2 — Pythagoras's (√2)
- Digit 1,989 = 8
- ln 2 — Natural log of 2
- Digit 1,989 = 7
- γ — Euler-Mascheroni (γ)
- Digit 1,989 = 1
Also seen as
UTF-8 encoding: DF 85 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.197.
- Address
- 0.0.7.197
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.197
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1989 first appears in π at position 997 of the decimal expansion (the 997ordinal-suffix:th 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.