1,230
1,230 is a composite number, even, a calendar year.
Historical context — 1230 AD
Calendar year
Year 1230 (MCCXXX) was a common year starting on Tuesday of the Julian 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
-
Tuesday
January 1, 1230
- Ended on
-
Tuesday
December 31, 1230
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
1230s
1230–1239
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
796
796 years before 2026.
In other calendars
- Hebrew
-
4990 / 4991 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
627 / 628 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Tiger
Sexagenary cycle position 27 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1773 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
608 / 609 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1222 / 1223 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1152 / 1151 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 3 × 5 × 41
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand two hundred thirty
- Ordinal
- 1230th
- Roman numeral
- MCCXXX
- Binary
- 10011001110
- Octal
- 2316
- Hexadecimal
- 0x4CE
- Base64
- BM4=
- One's complement
- 64,305 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓎆𓎆
- Greek (Milesian)
- ͵ασλʹ
- Mayan (base 20)
- 𝋣·𝋡·𝋪
- Chinese
- 一千二百三十
- Chinese (financial)
- 壹仟貳佰參拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,230 = 4
- e — Euler's number (e)
- Digit 1,230 = 4
- φ — Golden ratio (φ)
- Digit 1,230 = 5
- √2 — Pythagoras's (√2)
- Digit 1,230 = 8
- ln 2 — Natural log of 2
- Digit 1,230 = 0
- γ — Euler-Mascheroni (γ)
- Digit 1,230 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1230, here are decompositions:
- 7 + 1223 = 1230
- 13 + 1217 = 1230
- 17 + 1213 = 1230
- 29 + 1201 = 1230
- 37 + 1193 = 1230
- 43 + 1187 = 1230
- 59 + 1171 = 1230
- 67 + 1163 = 1230
Showing the first eight; more decompositions exist.
UTF-8 encoding: D3 8E (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.206.
- Address
- 0.0.4.206
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.206
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1230 first appears in π at position 7,145 of the decimal expansion (the 7,145ordinal-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.