442
442 is a composite number, even, a calendar year.
442 (four hundred forty-two) is an even 3-digit number. It is a composite number with 8 divisors, and factors as 2 × 13 × 17. Written other ways, in Roman numerals it is CDXLII and in binary, 110111010.
Interestingness
Historical context — 442 AD
Calendar year
Year 442 (CDXLII) was a common year starting on Thursday of the Julian calendar.
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Historical context — 442 BC
Calendar year
Year 442 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
-
Wednesday
January 1, 442
- Ended on
-
Wednesday
December 31, 442
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
440s
440–449
- Century
-
5th century
401–500
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,584
1584 years before 2026.
In other calendars
- Hebrew
-
4202 / 4203 AM
Rosh Hashanah falls in September/October.
- 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
-
985 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
434 / 435 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
364 / 363 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 13 × 17
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√442 = [21; (42)]
Period length 1 — the block in parentheses repeats forever.
Representations
- In words
- four hundred forty-two
- Ordinal
- 442nd
- Roman numeral
- CDXLII
- Binary
- 110111010
- Octal
- 672
- Hexadecimal
- 0x1BA
- Base64
- Abo=
- One's complement
- 65,093 (16-bit)
- Scientific notation
- 4.42 × 10²
- As a duration
- 442 s = 7 minutes, 22 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- υμβʹ
- Mayan (base 20)
- 𝋡·𝋢·𝋢
- Chinese
- 四百四十二
- Chinese (financial)
- 肆佰肆拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 442 = 3
- e — Euler's number (e)
- Digit 442 = 5
- φ — Golden ratio (φ)
- Digit 442 = 1
- √2 — Pythagoras's (√2)
- Digit 442 = 7
- ln 2 — Natural log of 2
- Digit 442 = 2
- γ — Euler-Mascheroni (γ)
- Digit 442 = 9
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 442, here are decompositions:
- 3 + 439 = 442
- 11 + 431 = 442
- 23 + 419 = 442
- 41 + 401 = 442
- 53 + 389 = 442
- 59 + 383 = 442
- 83 + 359 = 442
- 89 + 353 = 442
Showing the first eight; more decompositions exist.
UTF-8 encoding: C6 BA (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.186.
- Address
- 0.0.1.186
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.1.186
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 442 is an active NANP area code (North American Numbering Plan).
- Primary area
- Riverside / San Bernardino
- Region
- California
- Country
- United States
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.
Heard as a frequency, 442 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A4 (440 Hz, +8¢)
- Scientific pitch (C4 = 256 Hz): A4 (430.5 Hz, +45¢ — about midway to A♯4)
- Baroque pitch (A4 = 415 Hz): A♯4 (439.7 Hz, +9¢)
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.