230
230 is a composite number, even, a calendar year.
230 (two hundred thirty) is an even 3-digit number. It is a composite number with 8 divisors, and factors as 2 × 5 × 23. Written other ways, in Roman numerals it is CCXXX and in binary, 11100110.
Interestingness
Historical context — 230 AD
Calendar year
Year 230 (CCXXX) was a common year starting on Friday of the Julian calendar.
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Historical context — 230 BC
Calendar year
Year 230 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
-
Friday
January 1, 230
- Ended on
-
Friday
December 31, 230
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
230s
230–239
- Century
-
3rd century
201–300
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,796
1796 years before 2026.
In other calendars
- Hebrew
-
3990 / 3991 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Metal zodiac:Dog
Sexagenary cycle position 47 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
773 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
222 / 223 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
152 / 151 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 5 × 23
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√230 = [15; (6, 30)]
Period length 2 — the block in parentheses repeats forever.
Representations
- In words
- two hundred thirty
- Ordinal
- 230th
- Roman numeral
- CCXXX
- Binary
- 11100110
- Octal
- 346
- Hexadecimal
- 0xE6
- Base64
- 5g==
- One's complement
- 25 (8-bit)
- Scientific notation
- 2.3 × 10²
- As a duration
- 230 s = 3 minutes, 50 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓍢𓍢𓎆𓎆𓎆
- Greek (Milesian)
- σλʹ
- Mayan (base 20)
- 𝋫·𝋪
- Chinese
- 二百三十
- Chinese (financial)
- 貳佰參拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 230 = 2
- e — Euler's number (e)
- Digit 230 = 8
- φ — Golden ratio (φ)
- Digit 230 = 2
- √2 — Pythagoras's (√2)
- Digit 230 = 0
- ln 2 — Natural log of 2
- Digit 230 = 5
- γ — Euler-Mascheroni (γ)
- Digit 230 = 7
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 230, here are decompositions:
- 3 + 227 = 230
- 7 + 223 = 230
- 19 + 211 = 230
- 31 + 199 = 230
- 37 + 193 = 230
- 67 + 163 = 230
- 73 + 157 = 230
- 79 + 151 = 230
Showing the first eight; more decompositions exist.
UTF-8 encoding: C3 A6 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.230.
- Address
- 0.0.0.230
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.230
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 230 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A♯3 (233.1 Hz, -23¢)
- Scientific pitch (C4 = 256 Hz): A♯3 (228.1 Hz, +15¢)
- Baroque pitch (A4 = 415 Hz): B3 (232.9 Hz, -22¢)
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.