1,670
1,670 is a composite number, even, a calendar year.
Notable events — 1670 AD
- May 2 The Hudson's Bay Company is chartered by Charles II.
- Jun 1 The Secret Treaty of Dover allies Charles II with Louis XIV against the Dutch.
- Dec 11 Stenka Razin's revolt collapses in Russia.
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, 1670
- Ended on
-
Wednesday
December 31, 1670
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
April 6
Sunday, April 6, 1670
- Decade
-
1670s
1670–1679
- Century
-
17th century
1601–1700
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
356
356 years before 2026.
In other calendars
- Hebrew
-
5430 / 5431 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1080 / 1081 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Dog
Sexagenary cycle position 47 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2213 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1048 / 1049 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1662 / 1663 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1592 / 1591 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 5 × 167
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand six hundred seventy
- Ordinal
- 1670th
- Roman numeral
- MDCLXX
- Binary
- 11010000110
- Octal
- 3206
- Hexadecimal
- 0x686
- Base64
- BoY=
- One's complement
- 63,865 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵αχοʹ
- Mayan (base 20)
- 𝋤·𝋣·𝋪
- Chinese
- 一千六百七十
- Chinese (financial)
- 壹仟陸佰柒拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,670 = 4
- e — Euler's number (e)
- Digit 1,670 = 2
- φ — Golden ratio (φ)
- Digit 1,670 = 7
- √2 — Pythagoras's (√2)
- Digit 1,670 = 4
- ln 2 — Natural log of 2
- Digit 1,670 = 6
- γ — Euler-Mascheroni (γ)
- Digit 1,670 = 8
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1670, here are decompositions:
- 3 + 1667 = 1670
- 7 + 1663 = 1670
- 13 + 1657 = 1670
- 43 + 1627 = 1670
- 61 + 1609 = 1670
- 73 + 1597 = 1670
- 103 + 1567 = 1670
- 127 + 1543 = 1670
Showing the first eight; more decompositions exist.
UTF-8 encoding: DA 86 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.134.
- Address
- 0.0.6.134
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.6.134
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1670 first appears in π at position 7,824 of the decimal expansion (the 7,824ordinal-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.