1,816
1,816 is a composite number, even, a calendar year.
Notable events — 1816 AD
- Jul 9 Argentina formally declares independence from Spain.
- Undated The "Year Without a Summer" follows the Tambora eruption, causing widespread crop failures.
- Jun 16 At Lake Geneva, Mary Shelley conceives the idea for Frankenstein.
- Dec 11 Indiana becomes the 19th US state.
- Nov 2 Stamford Raffles arrives in Java; Britain returns the colony to the Dutch in August 1816.
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
-
Monday
January 1, 1816
- Ended on
-
Tuesday
December 31, 1816
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
April 14
Sunday, April 14, 1816
- Decade
-
1810s
1810–1819
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
210
210 years before 2026.
- US presidential election
-
Yes
US holds a presidential election in years divisible by 4 starting from 1788.
In other calendars
- Hebrew
-
5576 / 5577 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1231 / 1232 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Fire zodiac:Rat
Sexagenary cycle position 13 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2359 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1194 / 1195 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1808 / 1809 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1738 / 1737 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 16
- Digit product
- 48
- Digital root
- 7
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 6,181
- Flips to (rotate 180°)
- 9,181
- Recamán's sequence
- a(455) = 1,816
- Square (n²)
- 3,297,856
- Cube (n³)
- 5,988,906,496
- Divisor count
- 8
- σ(n) — sum of divisors
- 3,420
- φ(n) — Euler's totient
- 904
- Sum of prime factors
- 233
Primality
Prime factorization: 2 3 × 227
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand eight hundred sixteen
- Ordinal
- 1816th
- Roman numeral
- MDCCCXVI
- Binary
- 11100011000
- Octal
- 3430
- Hexadecimal
- 0x718
- Base64
- Bxg=
- One's complement
- 63,719 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋 𒌋𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αωιϛʹ
- Mayan (base 20)
- 𝋤·𝋪·𝋰
- Chinese
- 一千八百一十六
- Chinese (financial)
- 壹仟捌佰壹拾陸
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,816 = 4
- e — Euler's number (e)
- Digit 1,816 = 4
- φ — Golden ratio (φ)
- Digit 1,816 = 1
- √2 — Pythagoras's (√2)
- Digit 1,816 = 2
- ln 2 — Natural log of 2
- Digit 1,816 = 5
- γ — Euler-Mascheroni (γ)
- Digit 1,816 = 7
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1816, here are decompositions:
- 5 + 1811 = 1816
- 29 + 1787 = 1816
- 83 + 1733 = 1816
- 107 + 1709 = 1816
- 149 + 1667 = 1816
- 179 + 1637 = 1816
- 197 + 1619 = 1816
- 233 + 1583 = 1816
Showing the first eight; more decompositions exist.
UTF-8 encoding: DC 98 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.24.
- Address
- 0.0.7.24
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.24
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1816 first appears in π at position 21,526 of the decimal expansion (the 21,526ordinal-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.