Number

423

423 is a composite number, odd, a calendar year.

Arithmetic Number Deficient Number Evil Number Harshad / Niven Recamán's Sequence Year

Historical context — 423 AD

Calendar year

Year 423 (CDXXIII) was a common year starting on Monday of the Julian calendar.

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Historical context — 423 BC

Calendar year

Year 423 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: Sunday
January 1, 423
Ended on: Sunday
December 31, 423
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 420s
420–429
Century: 5th century
401–500
Millennium: 1st millennium
1–1000
Years ago: 1,603
1603 years before 2026.

In other calendars

Hebrew: 4183 / 4184 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Water zodiac:Pig
Sexagenary cycle position 60 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 966 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 415 / 416 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 345 / 344 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 9
Digit product: 24
Digital root: 9
Palindrome: No
Bit width: 9 bits
Reversed: 324
Recamán's sequence: a(470) = 423
Square (n²): 178,929
Cube (n³): 75,686,967
Divisor count: 6
σ(n) — sum of divisors: 624
φ(n) — Euler's totient: 276
Sum of prime factors: 53

Primality

Prime factorization: 3 ² × 47

Nearest primes: 421 (−2) · 431 (+8)

Divisors & multiples

All divisors (6)

1 · 3 · 9 · 47 · 141 · 423

Aliquot sum (sum of proper divisors): 201

Factor pairs (a × b = 423)

1 × 423

3 × 141

9 × 47

First multiples

423 · 846 (double) · 1,269 · 1,692 · 2,115 · 2,538 · 2,961 · 3,384 · 3,807 · 4,230

Sums & aliquot sequence

As consecutive integers: 211 + 212 140 + 141 + 142 68 + 69 + 70 + 71 + 72 + 73 43 + 44 + … + 51

Aliquot sequence: 423 → 201 → 71 → 1 → 0 — terminates at zero

Representations

In words: four hundred twenty-three
Ordinal: 423rd
Roman numeral: CDXXIII
Binary: 110100111
Octal: 647
Hexadecimal: 0x1A7
Base64: Aac=
One's complement: 65,112 (16-bit)

In other bases

ternary (3) 120200

quaternary (4) 12213

quinary (5) 3143

senary (6) 1543

septenary (7) 1143

nonary (9) 520

undecimal (11) 355

duodecimal (12) 2b3

tridecimal (13) 267

tetradecimal (14) 223

pentadecimal (15) 1d3

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺
Greek (Milesian): υκγʹ
Mayan (base 20): 𝋡·𝋡·𝋣
Chinese: 四百二十三
Chinese (financial): 肆佰貳拾參

In other modern scripts

Eastern Arabic ٤٢٣ Devanagari ४२३ Bengali ৪২৩ Tamil ௪௨௩ Thai ๔๒๓ Tibetan ༤༢༣ Khmer ៤២៣ Lao ໔໒໓ Burmese ၄၂၃

Digit at this position in famous constants

π — Pi (π): Digit 423 = 9
e — Euler's number (e): Digit 423 = 6
φ — Golden ratio (φ): Digit 423 = 0
√2 — Pythagoras's (√2): Digit 423 = 3
ln 2 — Natural log of 2: Digit 423 = 2
γ — Euler-Mascheroni (γ): Digit 423 = 7

Also seen as

Unicode codepoint

Latin Capital Letter Tone Two

U+01A7

Uppercase letter (Lu)

UTF-8 encoding: C6 A7 (2 bytes).

Lookup U+01A7 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0001A7

RGB(0, 1, 167)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.167.

Address: 0.0.1.167
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.167

Unspecified address (0.0.0.0/8) — "this network" placeholder.

NANP area code 423

The number 423 is an active NANP area code (North American Numbering Plan).

Primary area: Chattanooga / Knoxville
Region: Tennessee
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 423 ↗