989
989 is a composite number, odd, a calendar year.
989 (nine hundred eighty-nine) is an odd 3-digit number. It is a composite number with 4 divisors, and factors as 23 × 43. Its digits read the same forwards and backwards, so it is a palindromic number. Written other ways, in Roman numerals it is CMLXXXIX and in binary, 1111011101.
Interestingness
Historical context — 989 AD
Calendar year
Year 989 (CMLXXXIX) was a common year starting on Tuesday of the Julian calendar.
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Historical context — 989 BC
Decade
The 980s BC is a decade that lasted from 989 BC to 980 BC.
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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
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 989
- Ended on
-
Thursday
December 31, 989
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
980s
980–989
- Century
-
10th century
901–1000
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,037
1037 years before 2026.
In other calendars
- Hebrew
-
4749 / 4750 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
378 / 379 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Ox
Sexagenary cycle position 26 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1532 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
367 / 368 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
981 / 982 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
911 / 910 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 23 × 43
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√989 = [31; (2, 4, 2, 1, 11, 1, 8, 15, 1, 1, 1, 1, 2, 1, 2, 2, 2, 1, 2, 1, 1, 1, 1, 15, …)]
Period length 32 — the block in parentheses repeats forever.
Representations
- In words
- nine hundred eighty-nine
- Ordinal
- 989th
- Roman numeral
- CMLXXXIX
- Binary
- 1111011101
- Octal
- 1735
- Hexadecimal
- 0x3DD
- Base64
- A90=
- One's complement
- 64,546 (16-bit)
- Scientific notation
- 9.89 × 10²
- As a duration
- 989 s = 16 minutes, 29 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ϡπθʹ
- Mayan (base 20)
- 𝋢·𝋩·𝋩
- Chinese
- 九百八十九
- Chinese (financial)
- 玖佰捌拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 989 = 9
- e — Euler's number (e)
- Digit 989 = 6
- φ — Golden ratio (φ)
- Digit 989 = 5
- √2 — Pythagoras's (√2)
- Digit 989 = 8
- ln 2 — Natural log of 2
- Digit 989 = 7
- γ — Euler-Mascheroni (γ)
- Digit 989 = 3
Also seen as
UTF-8 encoding: CF 9D (2 bytes).
TCP/UDP port 989 is the well-known port for FTPS-DATA — FTP over TLS — data channel.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.221.
- Address
- 0.0.3.221
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.221
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 989 is an active NANP area code (North American Numbering Plan).
- Primary area
- Saginaw / Bay City
- Region
- Michigan
- Country
- United States
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.
Heard as a frequency, 989 Hz is closest to:
- Concert pitch (A4 = 440 Hz): B5 (987.8 Hz, +2¢)
- Scientific pitch (C4 = 256 Hz): B5 (966.5 Hz, +40¢)
- Baroque pitch (A4 = 415 Hz): C6 (987 Hz, +3¢)
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.