1,228
1,228 is a composite number, even, a calendar year.
1,228 (one thousand two hundred twenty-eight) is an even 4-digit number. It is a composite number with 6 divisors, and factors as 2² × 307. Written other ways, in Roman numerals it is MCCXXVIII and in binary, 10011001100.
Interestingness
Historical context — 1228 AD
Calendar year
Year 1228 (MCCXXVIII) was a leap year starting on Saturday of the Julian calendar.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →
Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
- 52
- Started on
-
Saturday
January 1, 1228
- Ended on
-
Sunday
December 31, 1228
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1220s
1220–1229
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
798
798 years before 2026.
In other calendars
- Hebrew
-
4988 / 4989 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
625 / 626 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Rat
Sexagenary cycle position 25 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1771 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
606 / 607 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1220 / 1221 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1150 / 1149 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 2 × 307
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,228 = [35; (23, 2, 1, 7, 8, 1, 1, 1, 2, 2, 1, 1, 5, 3, 1, 16, 1, 3, 5, 1, 1, 2, 2, 1, …)]
Period length 32 — the block in parentheses repeats forever.
Representations
- In words
- one thousand two hundred twenty-eight
- Ordinal
- 1228th
- Roman numeral
- MCCXXVIII
- Binary
- 10011001100
- Octal
- 2314
- Hexadecimal
- 0x4CC
- Base64
- BMw=
- One's complement
- 64,307 (16-bit)
- Scientific notation
- 1.228 × 10³
- As a duration
- 1,228 s = 20 minutes, 28 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ασκηʹ
- Mayan (base 20)
- 𝋣·𝋡·𝋨
- Chinese
- 一千二百二十八
- Chinese (financial)
- 壹仟貳佰貳拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,228 = 1
- e — Euler's number (e)
- Digit 1,228 = 2
- φ — Golden ratio (φ)
- Digit 1,228 = 3
- √2 — Pythagoras's (√2)
- Digit 1,228 = 0
- ln 2 — Natural log of 2
- Digit 1,228 = 7
- γ — Euler-Mascheroni (γ)
- Digit 1,228 = 4
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1228, here are decompositions:
- 5 + 1223 = 1228
- 11 + 1217 = 1228
- 41 + 1187 = 1228
- 47 + 1181 = 1228
- 131 + 1097 = 1228
- 137 + 1091 = 1228
- 167 + 1061 = 1228
- 179 + 1049 = 1228
Showing the first eight; more decompositions exist.
UTF-8 encoding: D3 8C (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.204.
- Address
- 0.0.4.204
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.204
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,228 Hz is closest to:
- Concert pitch (A4 = 440 Hz): D♯6 (1244.5 Hz, -23¢)
- Scientific pitch (C4 = 256 Hz): D♯6 (1217.7 Hz, +15¢)
- Baroque pitch (A4 = 415 Hz): E6 (1243.6 Hz, -22¢)
The digit sequence 1228 first appears in π at position 5,182 of the decimal expansion (the 5,182ordinal-suffix:nd 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.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.