1,222
1,222 is a composite number, even, a calendar year.
1,222 (one thousand two hundred twenty-two) is an even 4-digit number. It is a composite number with 8 divisors, and factors as 2 × 13 × 47. Written other ways, in Roman numerals it is MCCXXII and in binary, 10011000110.
Interestingness
Historical context — 1222 AD
Calendar year
Year 1222 (MCCXXII) was a common year starting on Saturday 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
-
Saturday
January 1, 1222
- Ended on
-
Saturday
December 31, 1222
- 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
-
804
804 years before 2026.
In other calendars
- Hebrew
-
4982 / 4983 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
618 / 619 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Water zodiac:Horse
Sexagenary cycle position 19 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1765 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
600 / 601 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1214 / 1215 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1144 / 1143 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 13 × 47
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,222 = [34; (1, 22, 3, 7, 2, 3, 1, 1, 1, 4, 2, 1, 4, 1, 2, 4, 1, 1, 1, 3, 2, 7, 3, 22, …)]
Period length 26 — the block in parentheses repeats forever.
Representations
- In words
- one thousand two hundred twenty-two
- Ordinal
- 1222nd
- Roman numeral
- MCCXXII
- Binary
- 10011000110
- Octal
- 2306
- Hexadecimal
- 0x4C6
- Base64
- BMY=
- One's complement
- 64,313 (16-bit)
- Scientific notation
- 1.222 × 10³
- As a duration
- 1,222 s = 20 minutes, 22 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵ασκβʹ
- Mayan (base 20)
- 𝋣·𝋡·𝋢
- Chinese
- 一千二百二十二
- Chinese (financial)
- 壹仟貳佰貳拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,222 = 4
- e — Euler's number (e)
- Digit 1,222 = 0
- φ — Golden ratio (φ)
- Digit 1,222 = 4
- √2 — Pythagoras's (√2)
- Digit 1,222 = 4
- ln 2 — Natural log of 2
- Digit 1,222 = 7
- γ — Euler-Mascheroni (γ)
- Digit 1,222 = 7
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1222, here are decompositions:
- 5 + 1217 = 1222
- 29 + 1193 = 1222
- 41 + 1181 = 1222
- 59 + 1163 = 1222
- 71 + 1151 = 1222
- 113 + 1109 = 1222
- 131 + 1091 = 1222
- 173 + 1049 = 1222
Showing the first eight; more decompositions exist.
UTF-8 encoding: D3 86 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.198.
- Address
- 0.0.4.198
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.198
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,222 Hz is closest to:
- Concert pitch (A4 = 440 Hz): D♯6 (1244.5 Hz, -32¢)
- Scientific pitch (C4 = 256 Hz): D♯6 (1217.7 Hz, +6¢)
- Baroque pitch (A4 = 415 Hz): E6 (1243.6 Hz, -30¢)
The digit sequence 1222 first appears in π at position 17,881 of the decimal expansion (the 17,881ordinal-suffix:st 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.