805
805 is a composite number, odd, a calendar year.
Historical context — 805 AD
Calendar year
Year 805 (DCCCV) was a common year starting on Wednesday of the Julian calendar, the 805th year of the Common Era (CE) and Anno Domini (AD) designations, the 805th year of the 1st millennium, the 5th year of the 9th century, and the 6th year of the 800s decade.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →
Historical context — 805 BC
Decade
This article concerns the period 809 BC – 800 BC.
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
-
Saturday
January 1, 805
- Ended on
-
Saturday
December 31, 805
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
800s
800–809
- Century
-
9th century
801–900
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,221
1221 years before 2026.
In other calendars
- Hebrew
-
4565 / 4566 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
189 / 190 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Rooster
Sexagenary cycle position 22 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1348 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
183 / 184 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
797 / 798 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
727 / 726 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 5 × 7 × 23
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- eight hundred five
- Ordinal
- 805th
- Roman numeral
- DCCCV
- Binary
- 1100100101
- Octal
- 1445
- Hexadecimal
- 0x325
- Base64
- AyU=
- One's complement
- 64,730 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ωεʹ
- Mayan (base 20)
- 𝋢·𝋠·𝋥
- Chinese
- 八百零五
- Chinese (financial)
- 捌佰零伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 805 = 4
- e — Euler's number (e)
- Digit 805 = 7
- φ — Golden ratio (φ)
- Digit 805 = 7
- √2 — Pythagoras's (√2)
- Digit 805 = 6
- ln 2 — Natural log of 2
- Digit 805 = 9
- γ — Euler-Mascheroni (γ)
- Digit 805 = 9
Also seen as
UTF-8 encoding: CC A5 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.37.
- Address
- 0.0.3.37
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.37
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 805 is an active NANP area code (North American Numbering Plan).
- Primary area
- Santa Barbara / Ventura
- Region
- California
- 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.
Type 805 on a seven-segment calculator, flip it 180°, and the display reads:
SOB
A staple of calculator humor since pocket calculators put digits in front of bored students.