422
422 is a composite number, even, a calendar year.
422 (four hundred twenty-two) is an even 3-digit number. It is a composite number with 4 divisors, and factors as 2 × 211. Written other ways, in Roman numerals it is CDXXII and in binary, 110100110.
Interestingness
Historical context — 422 AD
Calendar year
Year 422 (CDXXII) was a common year starting on Sunday of the Julian calendar.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →
Historical context — 422 BC
Calendar year
Year 422 BC was a year of the pre-Julian Roman calendar.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →
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, 422
- Ended on
-
Saturday
December 31, 422
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
420s
420–429
- Century
-
5th century
401–500
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,604
1604 years before 2026.
In other calendars
- Hebrew
-
4182 / 4183 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Water zodiac:Dog
Sexagenary cycle position 59 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
965 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
414 / 415 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
344 / 343 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 211
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√422 = [20; (1, 1, 5, 2, 1, 3, 20, 3, 1, 2, 5, 1, 1, 40)]
Period length 14 — the block in parentheses repeats forever.
Representations
- In words
- four hundred twenty-two
- Ordinal
- 422nd
- Roman numeral
- CDXXII
- Binary
- 110100110
- Octal
- 646
- Hexadecimal
- 0x1A6
- Base64
- AaY=
- One's complement
- 65,113 (16-bit)
- Scientific notation
- 4.22 × 10²
- As a duration
- 422 s = 7 minutes, 2 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺
- Greek (Milesian)
- υκβʹ
- Mayan (base 20)
- 𝋡·𝋡·𝋢
- Chinese
- 四百二十二
- Chinese (financial)
- 肆佰貳拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 422 = 0
- e — Euler's number (e)
- Digit 422 = 4
- φ — Golden ratio (φ)
- Digit 422 = 7
- √2 — Pythagoras's (√2)
- Digit 422 = 0
- ln 2 — Natural log of 2
- Digit 422 = 9
- γ — Euler-Mascheroni (γ)
- Digit 422 = 2
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 422, here are decompositions:
- 3 + 419 = 422
- 13 + 409 = 422
- 43 + 379 = 422
- 73 + 349 = 422
- 109 + 313 = 422
- 139 + 283 = 422
- 151 + 271 = 422
- 181 + 241 = 422
Showing the first eight; more decompositions exist.
UTF-8 encoding: C6 A6 (2 bytes).
HTTP 422 Unprocessable Entity — Request was well-formed but semantically invalid.
4xx class: Client Error.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.166.
- Address
- 0.0.1.166
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.1.166
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 422 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G♯4 (415.3 Hz, +28¢)
- Scientific pitch (C4 = 256 Hz): A4 (430.5 Hz, -35¢)
- Baroque pitch (A4 = 415 Hz): A4 (415 Hz, +29¢)
On an ingredients label, E422 is Glycerol, a thickener, stabiliser or emulsifier.
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.