1,642
1,642 is a composite number, even, a calendar year.
Notable events — 1642 AD
- Aug 22 Charles I raises his standard at Nottingham, beginning the English Civil War.
- Oct 23 The first major battle of the war is fought at Edgehill.
- Dec 13 Abel Tasman becomes the first European to reach New Zealand.
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, 1642
- Ended on
-
Wednesday
December 31, 1642
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
April 20
Sunday, April 20, 1642
- Decade
-
1640s
1640–1649
- Century
-
17th century
1601–1700
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
384
384 years before 2026.
In other calendars
- Hebrew
-
5402 / 5403 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1051 / 1052 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Water zodiac:Horse
Sexagenary cycle position 19 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2185 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1020 / 1021 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1634 / 1635 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1564 / 1563 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 13
- Digit product
- 48
- Digital root
- 4
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 2,461
- Recamán's sequence
- a(30,264) = 1,642
- Square (n²)
- 2,696,164
- Cube (n³)
- 4,427,101,288
- Divisor count
- 4
- σ(n) — sum of divisors
- 2,466
- φ(n) — Euler's totient
- 820
- Sum of prime factors
- 823
Primality
Prime factorization: 2 × 821
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand six hundred forty-two
- Ordinal
- 1642nd
- Roman numeral
- MDCXLII
- Binary
- 11001101010
- Octal
- 3152
- Hexadecimal
- 0x66A
- Base64
- Bmo=
- One's complement
- 63,893 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵αχμβʹ
- Mayan (base 20)
- 𝋤·𝋢·𝋢
- Chinese
- 一千六百四十二
- Chinese (financial)
- 壹仟陸佰肆拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,642 = 1
- e — Euler's number (e)
- Digit 1,642 = 7
- φ — Golden ratio (φ)
- Digit 1,642 = 5
- √2 — Pythagoras's (√2)
- Digit 1,642 = 8
- ln 2 — Natural log of 2
- Digit 1,642 = 7
- γ — Euler-Mascheroni (γ)
- Digit 1,642 = 7
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1642, here are decompositions:
- 5 + 1637 = 1642
- 23 + 1619 = 1642
- 29 + 1613 = 1642
- 41 + 1601 = 1642
- 59 + 1583 = 1642
- 71 + 1571 = 1642
- 83 + 1559 = 1642
- 89 + 1553 = 1642
Showing the first eight; more decompositions exist.
UTF-8 encoding: D9 AA (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.106.
- Address
- 0.0.6.106
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.6.106
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1642 first appears in π at position 992 of the decimal expansion (the 992ordinal-suffix:nd 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.