789
789 is a composite number, odd, a calendar year.
789 (seven hundred eighty-nine) is an odd 3-digit number. It is a composite number with 4 divisors, and factors as 3 × 263. Written other ways, in Roman numerals it is DCCLXXXIX and in binary, 1100010101.
Interestingness
Historical context — 789 AD
Calendar year
Year 789 (DCCLXXXIX) was a common year starting on Thursday of the Julian calendar.
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Historical context — 789 BC
Decade
This article concerns the period 789 BC – 780 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
- 52
- Started on
-
Sunday
January 1, 789
- Ended on
-
Sunday
December 31, 789
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
780s
780–789
- Century
-
8th century
701–800
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,237
1237 years before 2026.
In other calendars
- Hebrew
-
4549 / 4550 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
172 / 173 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
-
1332 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
167 / 168 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
781 / 782 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
711 / 710 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 3 × 263
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√789 = [28; (11, 4, 1, 1, 2, 3, 1, 13, 3, 1, 2, 18, 2, 1, 3, 13, 1, 3, 2, 1, 1, 4, 11, 56)]
Period length 24 — the block in parentheses repeats forever.
Representations
- In words
- seven hundred eighty-nine
- Ordinal
- 789th
- Roman numeral
- DCCLXXXIX
- Binary
- 1100010101
- Octal
- 1425
- Hexadecimal
- 0x315
- Base64
- AxU=
- One's complement
- 64,746 (16-bit)
- Scientific notation
- 7.89 × 10²
- As a duration
- 789 s = 13 minutes, 9 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ψπθʹ
- Mayan (base 20)
- 𝋡·𝋳·𝋩
- Chinese
- 七百八十九
- Chinese (financial)
- 柒佰捌拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 789 = 3
- e — Euler's number (e)
- Digit 789 = 4
- φ — Golden ratio (φ)
- Digit 789 = 0
- √2 — Pythagoras's (√2)
- Digit 789 = 9
- ln 2 — Natural log of 2
- Digit 789 = 5
- γ — Euler-Mascheroni (γ)
- Digit 789 = 3
Also seen as
UTF-8 encoding: CC 95 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.21.
- Address
- 0.0.3.21
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.21
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 789 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G5 (784 Hz, +11¢)
- Scientific pitch (C4 = 256 Hz): G5 (767.1 Hz, +49¢ — about midway to G♯5)
- Baroque pitch (A4 = 415 Hz): G♯5 (783.4 Hz, +12¢)
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.