1,690
1,690 is a composite number, even, a calendar year.
Notable events — 1690 AD
- Jul 1 William III defeats James II at the Battle of the Boyne.
- Jul 10 The Anglo-Dutch fleet is defeated at Beachy Head.
- Sep 24 John Locke publishes An Essay Concerning Human Understanding.
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, 1690
- Ended on
-
Sunday
December 31, 1690
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
March 26
Sunday, March 26, 1690
- Decade
-
1690s
1690–1699
- Century
-
17th century
1601–1700
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
336
336 years before 2026.
In other calendars
- Hebrew
-
5450 / 5451 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1101 / 1102 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Horse
Sexagenary cycle position 7 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2233 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1068 / 1069 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1682 / 1683 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1612 / 1611 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 16
- Digit product
- 0
- Digital root
- 7
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 961
- Flips to (rotate 180°)
- 691
- Recamán's sequence
- a(948) = 1,690
- Square (n²)
- 2,856,100
- Cube (n³)
- 4,826,809,000
- Divisor count
- 12
- σ(n) — sum of divisors
- 3,294
- φ(n) — Euler's totient
- 624
- Sum of prime factors
- 33
Primality
Prime factorization: 2 × 5 × 13 2
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand six hundred ninety
- Ordinal
- 1690th
- Roman numeral
- MDCXC
- Binary
- 11010011010
- Octal
- 3232
- Hexadecimal
- 0x69A
- Base64
- Bpo=
- One's complement
- 63,845 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵αχϟʹ
- Mayan (base 20)
- 𝋤·𝋤·𝋪
- Chinese
- 一千六百九十
- Chinese (financial)
- 壹仟陸佰玖拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,690 = 3
- e — Euler's number (e)
- Digit 1,690 = 1
- φ — Golden ratio (φ)
- Digit 1,690 = 8
- √2 — Pythagoras's (√2)
- Digit 1,690 = 9
- ln 2 — Natural log of 2
- Digit 1,690 = 0
- γ — Euler-Mascheroni (γ)
- Digit 1,690 = 9
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1690, here are decompositions:
- 23 + 1667 = 1690
- 53 + 1637 = 1690
- 71 + 1619 = 1690
- 83 + 1607 = 1690
- 89 + 1601 = 1690
- 107 + 1583 = 1690
- 131 + 1559 = 1690
- 137 + 1553 = 1690
Showing the first eight; more decompositions exist.
UTF-8 encoding: DA 9A (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.154.
- Address
- 0.0.6.154
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.6.154
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1690 first appears in π at position 3,409 of the decimal expansion (the 3,409ordinal-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.