Number

442

442 is a composite number, even, a calendar year.

Deficient Number Evil Number Recamán's Sequence Sphenic Number Squarefree Year

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

Parity: Even
Digit count: 3
Digit sum: 10
Digit product: 32
Digital root: 1
Palindrome: No
Bit width: 9 bits
Reversed: 244
Recamán's sequence: a(4,759) = 442
Square (n²): 195,364
Cube (n³): 86,350,888
Divisor count: 8
σ(n) — sum of divisors: 756
φ(n) — Euler's totient: 192
Sum of prime factors: 32

Primality

Prime factorization: 2 × 13 × 17

Nearest primes: 439 (−3) · 443 (+1)

Divisors & multiples

All divisors (8)

1 · 2 · 13 · 17 · 26 · 34 · 221 (half) · 442

Aliquot sum (sum of proper divisors): 314

Factor pairs (a × b = 442)

1 × 442

2 × 221

13 × 34

17 × 26

First multiples

442 · 884 (double) · 1,326 · 1,768 · 2,210 · 2,652 · 3,094 · 3,536 · 3,978 · 4,420

Sums & aliquot sequence

As a sum of two squares: 1² + 21² = 9² + 19²

As consecutive integers: 109 + 110 + 111 + 112 28 + 29 + … + 40 18 + 19 + … + 34

Aliquot sequence: 442 → 314 → 160 → 218 → 112 → 136 → 134 → 70 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

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)

In other bases

ternary (3) 121101

quaternary (4) 12322

quinary (5) 3232

senary (6) 2014

septenary (7) 1201

nonary (9) 541

undecimal (11) 372

duodecimal (12) 30a

tridecimal (13) 280

tetradecimal (14) 238

pentadecimal (15) 1e7

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

In other modern scripts

Eastern Arabic ٤٤٢ Devanagari ४४२ Bengali ৪৪২ Tamil ௪௪௨ Thai ๔๔๒ Tibetan ༤༤༢ Khmer ៤៤២ Lao ໔໔໒ Burmese ၄၄၂

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 decomposition

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.

Unicode codepoint

Latin Small Letter Ezh With Tail

U+01BA

Lowercase letter (Ll)

UTF-8 encoding: C6 BA (2 bytes).

Lookup U+01BA on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0001BA

RGB(0, 1, 186)

IPv4 address

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.

NANP area code 442

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.

Look up area code 442 ↗