403
403 is a composite number, odd, a calendar year.
403 (four hundred three) is an odd 3-digit number. It is a composite number with 4 divisors, and factors as 13 × 31. Written other ways, in Roman numerals it is CDIII and in binary, 110010011.
Interestingness
Historical context — 403 AD
Calendar year
Year 403 (CDIII) was a common year starting on Thursday of the Julian calendar.
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Historical context — 403 BC
Calendar year
Year 403 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, 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
Primality
Prime factorization: 13 × 31
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√403 = [20; (13, 2, 1, 3, 1, 3, 1, 2, 13, 40)]
Period length 10 — the block in parentheses repeats forever.
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)
- Scientific notation
- 4.03 × 10²
- As a duration
- 403 s = 6 minutes, 43 seconds
As an angle
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
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
UTF-8 encoding: C6 93 (2 bytes).
HTTP 403 Forbidden — Server understood the request but refuses to authorize it.
4xx class: Client Error.
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.
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.
Heard as a frequency, 403 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G4 (392 Hz, +48¢ — about midway to G♯4)
- Scientific pitch (C4 = 256 Hz): G♯4 (406.4 Hz, -14¢)
- Baroque pitch (A4 = 415 Hz): G♯4 (391.7 Hz, +49¢ — about midway to A4)
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.