389
389 is a prime, odd, a calendar year.
389 (three hundred eighty-nine) is an odd 3-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in Roman numerals it is CCCLXXXIX and in binary, 110000101.
Interestingness
Historical context — 389 AD
Calendar year
Year 389 (CCCLXXXIX) was a common year starting on Monday of the Julian calendar.
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Historical context — 389 BC
Calendar year
Year 389 BC was a year of the pre-Julian Roman calendar.
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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, 389
- Ended on
-
Sunday
December 31, 389
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
380s
380–389
- Century
-
4th century
301–400
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,637
1637 years before 2026.
In other calendars
- Hebrew
-
4149 / 4150 AM
Rosh Hashanah falls in September/October.
- 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
-
932 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
381 / 382 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
311 / 310 Saka
Indian national calendar; year starts in March.
Properties
Primality
389 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√389 = [19; (1, 2, 1, 1, 1, 1, 2, 1, 38)]
Period length 9 — the block in parentheses repeats forever.
Representations
- In words
- three hundred eighty-nine
- Ordinal
- 389th
- Roman numeral
- CCCLXXXIX
- Binary
- 110000101
- Octal
- 605
- Hexadecimal
- 0x185
- Base64
- AYU=
- One's complement
- 65,146 (16-bit)
- Scientific notation
- 3.89 × 10²
- As a duration
- 389 s = 6 minutes, 29 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- τπθʹ
- Mayan (base 20)
- 𝋳·𝋩
- Chinese
- 三百八十九
- Chinese (financial)
- 參佰捌拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 389 = 9
- e — Euler's number (e)
- Digit 389 = 9
- φ — Golden ratio (φ)
- Digit 389 = 2
- √2 — Pythagoras's (√2)
- Digit 389 = 6
- ln 2 — Natural log of 2
- Digit 389 = 3
- γ — Euler-Mascheroni (γ)
- Digit 389 = 5
Also seen as
UTF-8 encoding: C6 85 (2 bytes).
TCP/UDP port 389 is the well-known port for LDAP — Lightweight Directory Access Protocol.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.133.
- Address
- 0.0.1.133
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.1.133
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 389 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G4 (392 Hz, -13¢)
- Scientific pitch (C4 = 256 Hz): G4 (383.6 Hz, +24¢)
- Baroque pitch (A4 = 415 Hz): G♯4 (391.7 Hz, -12¢)
Related reading
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.