1,639
1,639 is a composite number, odd, a calendar year.
1,639 (one thousand six hundred thirty-nine) is an odd 4-digit number. It is a composite number with 4 divisors, and factors as 11 × 149. Written other ways, in Roman numerals it is MDCXXXIX and in binary, 11001100111.
Interestingness
Notable events — 1639 AD
- Jun 18 The First Bishops' War ends without a battle.
- Oct 21 Spanish fleet is destroyed by the Dutch at the Battle of the Downs.
- Jan 14 Connecticut adopts the Fundamental Orders, an early colonial constitution.
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
-
Saturday
January 1, 1639
- Ended on
-
Saturday
December 31, 1639
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
April 24
Sunday, April 24, 1639
- Decade
-
1630s
1630–1639
- Century
-
17th century
1601–1700
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
387
387 years before 2026.
In other calendars
- Hebrew
-
5399 / 5400 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1048 / 1049 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Rabbit
Sexagenary cycle position 16 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2182 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1017 / 1018 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1631 / 1632 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1561 / 1560 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 11 × 149
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,639 = [40; (2, 15, 1, 2, 3, 2, 1, 15, 2, 80)]
Period length 10 — the block in parentheses repeats forever.
Representations
- In words
- one thousand six hundred thirty-nine
- Ordinal
- 1639th
- Roman numeral
- MDCXXXIX
- Binary
- 11001100111
- Octal
- 3147
- Hexadecimal
- 0x667
- Base64
- Bmc=
- One's complement
- 63,896 (16-bit)
- Scientific notation
- 1.639 × 10³
- As a duration
- 1,639 s = 27 minutes, 19 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αχλθʹ
- Mayan (base 20)
- 𝋤·𝋡·𝋳
- Chinese
- 一千六百三十九
- Chinese (financial)
- 壹仟陸佰參拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,639 = 1
- e — Euler's number (e)
- Digit 1,639 = 3
- φ — Golden ratio (φ)
- Digit 1,639 = 9
- √2 — Pythagoras's (√2)
- Digit 1,639 = 6
- ln 2 — Natural log of 2
- Digit 1,639 = 9
- γ — Euler-Mascheroni (γ)
- Digit 1,639 = 0
Also seen as
UTF-8 encoding: D9 A7 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.103.
- Address
- 0.0.6.103
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.6.103
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,639 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G♯6 (1661.2 Hz, -23¢)
- Scientific pitch (C4 = 256 Hz): G♯6 (1625.5 Hz, +14¢)
- Baroque pitch (A4 = 415 Hz): A6 (1660 Hz, -22¢)
The digit sequence 1639 first appears in π at position 3,516 of the decimal expansion (the 3,516ordinal-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.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.