1,845
1,845 is a composite number, odd, a calendar year.
Notable events — 1845 AD
- Mar 3 Florida becomes the 27th US state.
- Dec 29 Texas becomes the 28th US state.
- Jul 5 Henry David Thoreau moves to Walden Pond.
- May 19 The Franklin Expedition sets sail to find the Northwest Passage; all hands are eventually lost.
- Aug 16 The Irish potato famine begins.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
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
-
Wednesday
January 1, 1845
- Ended on
-
Wednesday
December 31, 1845
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
March 23
Sunday, March 23, 1845
- Decade
-
1840s
1840–1849
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
181
181 years before 2026.
In other calendars
- Hebrew
-
5605 / 5606 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1260 / 1262 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Snake
Sexagenary cycle position 42 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2388 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1223 / 1224 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1837 / 1838 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1767 / 1766 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 18
- Digit product
- 160
- Digital root
- 9
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 5,481
- Recamán's sequence
- a(8,054) = 1,845
- Square (n²)
- 3,404,025
- Cube (n³)
- 6,280,426,125
- Divisor count
- 12
- σ(n) — sum of divisors
- 3,276
- φ(n) — Euler's totient
- 960
- Sum of prime factors
- 52
Primality
Prime factorization: 3 2 × 5 × 41
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand eight hundred forty-five
- Ordinal
- 1845th
- Roman numeral
- MDCCCXLV
- Binary
- 11100110101
- Octal
- 3465
- Hexadecimal
- 0x735
- Base64
- BzU=
- One's complement
- 63,690 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αωμεʹ
- Mayan (base 20)
- 𝋤·𝋬·𝋥
- Chinese
- 一千八百四十五
- Chinese (financial)
- 壹仟捌佰肆拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,845 = 2
- e — Euler's number (e)
- Digit 1,845 = 3
- φ — Golden ratio (φ)
- Digit 1,845 = 5
- √2 — Pythagoras's (√2)
- Digit 1,845 = 4
- ln 2 — Natural log of 2
- Digit 1,845 = 4
- γ — Euler-Mascheroni (γ)
- Digit 1,845 = 1
Also seen as
UTF-8 encoding: DC B5 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.53.
- Address
- 0.0.7.53
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.53
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1845 first appears in π at position 2,867 of the decimal expansion (the 2,867ordinal-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.