800
800 is a composite number, even, a calendar year.
Notable events — 800 AD
- Dec 25 Pope Leo III crowns Charlemagne Emperor of the Romans in St. Peter's Basilica.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
Historical context — 800 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
-
Leap year
Divisible by 400 (Gregorian leap-year rule exception to the century rule).
- Days in year
- 366
- ISO weeks
- 52
- Started on
-
Saturday
January 1, 800
- Ended on
-
Sunday
December 31, 800
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
800s
800–809
- Century
-
8th century
701–800
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,226
1226 years before 2026.
In other calendars
- Hebrew
-
4560 / 4561 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
183 / 184 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Dragon
Sexagenary cycle position 17 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1343 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
178 / 179 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
792 / 793 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
722 / 721 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 8
- Digit product
- 0
- Digital root
- 8
- Palindrome
- No
- Bit width
- 10 bits
- Reversed
- 8
- Flips to (rotate 180°)
- 8
- Recamán's sequence
- a(291) = 800
- Square (n²)
- 640,000
- Cube (n³)
- 512,000,000
- Divisor count
- 18
- σ(n) — sum of divisors
- 1,953
- φ(n) — Euler's totient
- 320
- Sum of prime factors
- 20
Primality
Prime factorization: 2 5 × 5 2
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- eight hundred
- Ordinal
- 800th
- Roman numeral
- DCCC
- Binary
- 1100100000
- Octal
- 1440
- Hexadecimal
- 0x320
- Base64
- AyA=
- One's complement
- 64,735 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢
- Greek (Milesian)
- ωʹ
- Mayan (base 20)
- 𝋢·𝋠·𝋠
- Chinese
- 八百
- Chinese (financial)
- 捌佰
Digit at this position in famous constants
- π — Pi (π)
- Digit 800 = 5
- e — Euler's number (e)
- Digit 800 = 9
- φ — Golden ratio (φ)
- Digit 800 = 7
- √2 — Pythagoras's (√2)
- Digit 800 = 9
- ln 2 — Natural log of 2
- Digit 800 = 4
- γ — Euler-Mascheroni (γ)
- Digit 800 = 8
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 800, here are decompositions:
- 3 + 797 = 800
- 13 + 787 = 800
- 31 + 769 = 800
- 43 + 757 = 800
- 61 + 739 = 800
- 67 + 733 = 800
- 73 + 727 = 800
- 109 + 691 = 800
Showing the first eight; more decompositions exist.
UTF-8 encoding: CC A0 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.32.
- Address
- 0.0.3.32
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.32
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 800 is an active NANP area code (North American Numbering Plan).
- Primary area
- Toll-free
- Region
- (special)
- Country
- North America
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.