1,803
1,803 is a composite number, odd, a calendar year.
Notable events — 1803 AD
- Feb 24 Chief Justice John Marshall delivers Marbury v. Madison, establishing judicial review.
- Apr 30 The US doubles in size with the Louisiana Purchase.
- May 18 Britain declares war on France, resuming the Napoleonic conflict.
- Mar 1 Ohio becomes the 17th US state.
- Dec 20 France formally transfers Louisiana to the United States.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
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, 1803
- Ended on
-
Saturday
December 31, 1803
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
April 10
Sunday, April 10, 1803
- Decade
-
1800s
1800–1809
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
223
223 years before 2026.
In other calendars
- Hebrew
-
5563 / 5564 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1217 / 1218 AH
Lunar calendar; year spans differ from Gregorian.
- 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
-
2346 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1181 / 1182 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1795 / 1796 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1725 / 1724 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 12
- Digit product
- 0
- Digital root
- 3
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 3,081
- Recamán's sequence
- a(16,093) = 1,803
- Square (n²)
- 3,250,809
- Cube (n³)
- 5,861,208,627
- Divisor count
- 4
- σ(n) — sum of divisors
- 2,408
- φ(n) — Euler's totient
- 1,200
- Sum of prime factors
- 604
Primality
Prime factorization: 3 × 601
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand eight hundred three
- Ordinal
- 1803rd
- Roman numeral
- MDCCCIII
- Binary
- 11100001011
- Octal
- 3413
- Hexadecimal
- 0x70B
- Base64
- Bws=
- One's complement
- 63,732 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋 𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺𓏺𓏺
- Greek (Milesian)
- ͵αωγʹ
- Mayan (base 20)
- 𝋤·𝋪·𝋣
- Chinese
- 一千八百零三
- Chinese (financial)
- 壹仟捌佰零參
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,803 = 2
- e — Euler's number (e)
- Digit 1,803 = 5
- φ — Golden ratio (φ)
- Digit 1,803 = 3
- √2 — Pythagoras's (√2)
- Digit 1,803 = 5
- ln 2 — Natural log of 2
- Digit 1,803 = 6
- γ — Euler-Mascheroni (γ)
- Digit 1,803 = 4
Also seen as
UTF-8 encoding: DC 8B (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.11.
- Address
- 0.0.7.11
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.11
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1803 first appears in π at position 23,331 of the decimal expansion (the 23,331ordinal-suffix:st digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.