1,623
1,623 is a composite number, odd, a calendar year.
Notable events — 1623 AD
- Feb 9 The Amboyna Massacre of English traders by Dutch troops in the East Indies.
- Aug 6 Pope Urban VIII is elected.
- Aug 25 The First Folio of Shakespeare's plays is published.
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
-
Sunday
January 1, 1623
- Ended on
-
Sunday
December 31, 1623
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
April 16
Sunday, April 16, 1623
- Decade
-
1620s
1620–1629
- Century
-
17th century
1601–1700
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
403
403 years before 2026.
In other calendars
- Hebrew
-
5383 / 5384 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1032 / 1033 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Water zodiac:Pig
Sexagenary cycle position 60 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2166 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1001 / 1002 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1615 / 1616 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1545 / 1544 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 12
- Digit product
- 36
- Digital root
- 3
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 3,261
- Recamán's sequence
- a(706) = 1,623
- Square (n²)
- 2,634,129
- Cube (n³)
- 4,275,191,367
- Divisor count
- 4
- σ(n) — sum of divisors
- 2,168
- φ(n) — Euler's totient
- 1,080
- Sum of prime factors
- 544
Primality
Prime factorization: 3 × 541
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand six hundred twenty-three
- Ordinal
- 1623rd
- Roman numeral
- MDCXXIII
- Binary
- 11001010111
- Octal
- 3127
- Hexadecimal
- 0x657
- Base64
- Blc=
- One's complement
- 63,912 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺
- Greek (Milesian)
- ͵αχκγʹ
- Mayan (base 20)
- 𝋤·𝋡·𝋣
- Chinese
- 一千六百二十三
- Chinese (financial)
- 壹仟陸佰貳拾參
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,623 = 7
- e — Euler's number (e)
- Digit 1,623 = 5
- φ — Golden ratio (φ)
- Digit 1,623 = 3
- √2 — Pythagoras's (√2)
- Digit 1,623 = 3
- ln 2 — Natural log of 2
- Digit 1,623 = 2
- γ — Euler-Mascheroni (γ)
- Digit 1,623 = 7
Also seen as
UTF-8 encoding: D9 97 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.87.
- Address
- 0.0.6.87
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.6.87
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1623 first appears in π at position 5,005 of the decimal expansion (the 5,005ordinal-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.