1,840
1,840 is a composite number, even, a calendar year.
Notable events — 1840 AD
- Feb 10 Queen Victoria marries Prince Albert.
- Feb 6 The Treaty of Waitangi establishes British sovereignty in New Zealand.
- May 6 Britain issues the Penny Black, the world's first adhesive postage stamp.
- Nov 7 The Convention of Alexandria settles the Egypt-Ottoman crisis.
- Dec 2 William Henry Harrison defeats Martin Van Buren in the US presidential election.
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
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Wednesday
January 1, 1840
- Ended on
-
Thursday
December 31, 1840
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
April 19
Sunday, April 19, 1840
- Decade
-
1840s
1840–1849
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
186
186 years before 2026.
- US presidential election
-
Yes
US holds a presidential election in years divisible by 4 starting from 1788.
In other calendars
- Hebrew
-
5600 / 5601 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1255 / 1256 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Rat
Sexagenary cycle position 37 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2383 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1218 / 1219 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1832 / 1833 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1762 / 1761 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 4 × 5 × 23
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand eight hundred forty
- Ordinal
- 1840th
- Roman numeral
- MDCCCXL
- Binary
- 11100110000
- Octal
- 3460
- Hexadecimal
- 0x730
- Base64
- BzA=
- One's complement
- 63,695 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵αωμʹ
- Mayan (base 20)
- 𝋤·𝋬·𝋠
- Chinese
- 一千八百四十
- Chinese (financial)
- 壹仟捌佰肆拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,840 = 4
- e — Euler's number (e)
- Digit 1,840 = 8
- φ — Golden ratio (φ)
- Digit 1,840 = 1
- √2 — Pythagoras's (√2)
- Digit 1,840 = 3
- ln 2 — Natural log of 2
- Digit 1,840 = 3
- γ — Euler-Mascheroni (γ)
- Digit 1,840 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1840, here are decompositions:
- 17 + 1823 = 1840
- 29 + 1811 = 1840
- 53 + 1787 = 1840
- 107 + 1733 = 1840
- 131 + 1709 = 1840
- 173 + 1667 = 1840
- 227 + 1613 = 1840
- 233 + 1607 = 1840
Showing the first eight; more decompositions exist.
UTF-8 encoding: DC B0 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.48.
- Address
- 0.0.7.48
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.48
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1840 first appears in π at position 7,639 of the decimal expansion (the 7,639ordinal-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.