1,804
1,804 is a composite number, even, a calendar year.
Notable events — 1804 AD
- May 14 Lewis and Clark's Corps of Discovery departs St. Louis to explore the West.
- May 18 The French Senate proclaims Napoleon Emperor of the French.
- Jan 1 Haiti declares independence as the first Black-led republic.
- Jul 11 Aaron Burr fatally wounds Alexander Hamilton in a duel.
- Dec 2 Napoleon crowns himself Emperor at Notre-Dame in Paris.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
- 52
- Started on
-
Sunday
January 1, 1804
- Ended on
-
Monday
December 31, 1804
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Easter Sunday
-
April 1
Sunday, April 1, 1804
- Decade
-
1800s
1800–1809
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
222
222 years before 2026.
- US presidential election
-
Yes
US holds a presidential election in years divisible by 4 starting from 1788.
In other calendars
- Hebrew
-
5564 / 5565 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1218 / 1219 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Rat
Sexagenary cycle position 1 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2347 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1182 / 1183 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1796 / 1797 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1726 / 1725 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 13
- Digit product
- 0
- Digital root
- 4
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 4,081
- Recamán's sequence
- a(16,091) = 1,804
- Square (n²)
- 3,254,416
- Cube (n³)
- 5,870,966,464
- Divisor count
- 12
- σ(n) — sum of divisors
- 3,528
- φ(n) — Euler's totient
- 800
- Sum of prime factors
- 56
Primality
Prime factorization: 2 2 × 11 × 41
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand eight hundred four
- Ordinal
- 1804th
- Roman numeral
- MDCCCIV
- Binary
- 11100001100
- Octal
- 3414
- Hexadecimal
- 0x70C
- Base64
- Bww=
- One's complement
- 63,731 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋 𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αωδʹ
- Mayan (base 20)
- 𝋤·𝋪·𝋤
- Chinese
- 一千八百零四
- Chinese (financial)
- 壹仟捌佰零肆
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,804 = 7
- e — Euler's number (e)
- Digit 1,804 = 9
- φ — Golden ratio (φ)
- Digit 1,804 = 8
- √2 — Pythagoras's (√2)
- Digit 1,804 = 7
- ln 2 — Natural log of 2
- Digit 1,804 = 9
- γ — Euler-Mascheroni (γ)
- Digit 1,804 = 5
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1804, here are decompositions:
- 3 + 1801 = 1804
- 17 + 1787 = 1804
- 71 + 1733 = 1804
- 83 + 1721 = 1804
- 107 + 1697 = 1804
- 137 + 1667 = 1804
- 167 + 1637 = 1804
- 191 + 1613 = 1804
Showing the first eight; more decompositions exist.
UTF-8 encoding: DC 8C (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.12.
- Address
- 0.0.7.12
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.12
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1804 first appears in π at position 24,700 of the decimal expansion (the 24,700ordinal-suffix:th 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.