Number

203

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

203 (two hundred three) is an odd 3-digit number. It is a composite number with 4 divisors, and factors as 7 × 29. Written other ways, in Roman numerals it is CCIII and in binary, 11001011.

Arithmetic Number Bell Number Cube-Free Deficient Number Happy Number Odious Number Pernicious Number Recamán's Sequence Semiprime Squarefree Year

Interestingness

★ ★ ★ ★ ☆

7 notable facts · grade B

191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215

less more

Historical context — 203 AD

Calendar year

Year 203 (CCIII) was a common year starting on Saturday of the Julian calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →

Historical context — 203 BC

Calendar year

Year 203 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, 203
Ended on: Saturday
December 31, 203
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 200s
200–209
Century: 3rd century
201–300
Millennium: 1st millennium
1–1000
Years ago: 1,823
1823 years before 2026.

In other calendars

Hebrew: 3963 / 3964 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Water zodiac:Goat
Sexagenary cycle position 20 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 746 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 195 / 196 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 125 / 124 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 5
Digit product: 0
Digital root: 5
Palindrome: No
Bit width: 8 bits
Reversed: 302
Recamán's sequence: a(1,365) = 203
Square (n²): 41,209
Cube (n³): 8,365,427
Divisor count: 4
σ(n) — sum of divisors: 240
φ(n) — Euler's totient: 168
Sum of prime factors: 36

Primality

Prime factorization: 7 × 29

Nearest primes: 199 (−4) · 211 (+8)

Divisors & multiples

All divisors (4)

1 · 7 · 29 · 203

Aliquot sum (sum of proper divisors): 37

Factor pairs (a × b = 203)

1 × 203

7 × 29

First multiples

203 · 406 (double) · 609 · 812 · 1,015 · 1,218 · 1,421 · 1,624 · 1,827 · 2,030

Sums & aliquot sequence

As consecutive integers: 101 + 102 26 + 27 + … + 32 8 + 9 + … + 21

Aliquot sequence: 203 → 37 → 1 → 0 — terminates at zero

Continued fraction of √n

√203 = [14; (4, 28)]

Period length 2 — the block in parentheses repeats forever.

Representations

In words: two hundred three
Ordinal: 203rd
Roman numeral: CCIII
Binary: 11001011
Octal: 313
Hexadecimal: 0xCB
Base64: yw==
One's complement: 52 (8-bit)
Scientific notation: 2.03 × 10²
As a duration: 203 s = 3 minutes, 23 seconds

In other bases

ternary (3) 21112

quaternary (4) 3023

quinary (5) 1303

senary (6) 535

septenary (7) 410

nonary (9) 245

undecimal (11) 175

duodecimal (12) 14b

tridecimal (13) 128

tetradecimal (14) 107

pentadecimal (15) d8

Palindromic in base 3, base 6, base 8

As an angle

203°

203° ≈ 3.543 rad

Compass bearing: SSW (south-southwest)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓏺𓏺𓏺
Greek (Milesian): σγʹ
Mayan (base 20): 𝋪·𝋣
Chinese: 二百零三
Chinese (financial): 貳佰零參

In other modern scripts

Eastern Arabic ٢٠٣ Devanagari २०३ Bengali ২০৩ Tamil ௨௦௩ Thai ๒๐๓ Tibetan ༢༠༣ Khmer ២០៣ Lao ໒໐໓ Burmese ၂၀၃

Digit at this position in famous constants

π — Pi (π): Digit 203 = 4
e — Euler's number (e): Digit 203 = 5
φ — Golden ratio (φ): Digit 203 = 6
√2 — Pythagoras's (√2): Digit 203 = 1
ln 2 — Natural log of 2: Digit 203 = 1
γ — Euler-Mascheroni (γ): Digit 203 = 0

Also seen as

Unicode codepoint

Latin Capital Letter E With Diaeresis

U+00CB

Uppercase letter (Lu)

UTF-8 encoding: C3 8B (2 bytes).

Lookup U+00CB on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0000CB

RGB(0, 0, 203)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.203.

Address: 0.0.0.203
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.203

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

NANP area code 203

The number 203 is an active NANP area code (North American Numbering Plan).

Primary area: New Haven / Bridgeport
Region: Connecticut
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 203 ↗

Musical pitch

Heard as a frequency, 203 Hz is closest to:

Concert pitch (A4 = 440 Hz): G♯3 (207.7 Hz, -39¢)
Scientific pitch (C4 = 256 Hz): G♯3 (203.2 Hz, -2¢)
Baroque pitch (A4 = 415 Hz): A3 (207.5 Hz, -38¢)