Number

403

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

Arithmetic Number Deficient Number Heptagonal Odious Number Pernicious Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 403 AD

Calendar year

Year 403 (CDIII) was a common year starting on Thursday of the Julian calendar.

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

Historical context — 403 BC

Calendar year

Year 403 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback 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: Wednesday
January 1, 403
Ended on: Wednesday
December 31, 403
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 400s
400–409
Century: 5th century
401–500
Millennium: 1st millennium
1–1000
Years ago: 1,623
1623 years before 2026.

In other calendars

Hebrew: 4163 / 4164 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Water zodiac:Rabbit
Sexagenary cycle position 40 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 946 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 395 / 396 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 325 / 324 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 7
Digit product: 0
Digital root: 7
Palindrome: No
Bit width: 9 bits
Reversed: 304
Recamán's sequence: a(134) = 403
Square (n²): 162,409
Cube (n³): 65,450,827
Divisor count: 4
σ(n) — sum of divisors: 448
φ(n) — Euler's totient: 360
Sum of prime factors: 44

Primality

Prime factorization: 13 × 31

Nearest primes: 401 (−2) · 409 (+6)

Divisors & multiples

All divisors (4)

1 · 13 · 31 · 403

Aliquot sum (sum of proper divisors): 45

Factor pairs (a × b = 403)

1 × 403

13 × 31

First multiples

403 · 806 (double) · 1,209 · 1,612 · 2,015 · 2,418 · 2,821 · 3,224 · 3,627 · 4,030

Sums & aliquot sequence

As consecutive integers: 201 + 202 25 + 26 + … + 37 3 + 4 + … + 28

Aliquot sequence: 403 → 45 → 33 → 15 → 9 → 4 → 3 → 1 → 0 — terminates at zero

Representations

In words: four hundred three
Ordinal: 403rd
Roman numeral: CDIII
Binary: 110010011
Octal: 623
Hexadecimal: 0x193
Base64: AZM=
One's complement: 65,132 (16-bit)

In other bases

ternary (3) 112221

quaternary (4) 12103

quinary (5) 3103

senary (6) 1511

septenary (7) 1114

nonary (9) 487

undecimal (11) 337

duodecimal (12) 297

tridecimal (13) 250

tetradecimal (14) 20b

pentadecimal (15) 1bd

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓏺𓏺𓏺
Greek (Milesian): υγʹ
Mayan (base 20): 𝋡·𝋠·𝋣
Chinese: 四百零三
Chinese (financial): 肆佰零參

In other modern scripts

Eastern Arabic ٤٠٣ Devanagari ४०३ Bengali ৪০৩ Tamil ௪௦௩ Thai ๔๐๓ Tibetan ༤༠༣ Khmer ៤០៣ Lao ໔໐໓ Burmese ၄၀၃

Digit at this position in famous constants

π — Pi (π): Digit 403 = 3
e — Euler's number (e): Digit 403 = 2
φ — Golden ratio (φ): Digit 403 = 4
√2 — Pythagoras's (√2): Digit 403 = 0
ln 2 — Natural log of 2: Digit 403 = 0
γ — Euler-Mascheroni (γ): Digit 403 = 7

Also seen as

Unicode codepoint

Latin Capital Letter G With Hook

U+0193

Uppercase letter (Lu)

UTF-8 encoding: C6 93 (2 bytes).

Lookup U+0193 on Compart ↗ Lookup on FileFormat.Info ↗

HTTP status code

HTTP 403 Forbidden — Server understood the request but refuses to authorize it.

4xx class: Client Error.

Hex color

#000193

RGB(0, 1, 147)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.147.

Address: 0.0.1.147
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.147

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

NANP area code 403

The number 403 is an active NANP area code (North American Numbering Plan).

Primary area: Calgary / Southern Alberta
Region: Alberta
Country: Canada

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 403 ↗