1,604
1,604 is a composite number, even, a calendar year.
Notable events — 1604 AD
- Aug 18 The Treaty of London ends the Anglo-Spanish War.
- Oct 9 Kepler observes a supernova in Ophiuchus.
- Jan 16 The Hampton Court Conference produces the King James Bible commission.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 1604
- Ended on
-
Friday
December 31, 1604
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
April 18
Sunday, April 18, 1604
- Decade
-
1600s
1600–1609
- Century
-
17th century
1601–1700
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
422
422 years before 2026.
In other calendars
- Hebrew
-
5364 / 5365 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1012 / 1013 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Dragon
Sexagenary cycle position 41 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2147 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
982 / 983 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1596 / 1597 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1526 / 1525 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 11
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 4,061
- Recamán's sequence
- a(1,336) = 1,604
- Square (n²)
- 2,572,816
- Cube (n³)
- 4,126,796,864
- Divisor count
- 6
- σ(n) — sum of divisors
- 2,814
- φ(n) — Euler's totient
- 800
- Sum of prime factors
- 405
Primality
Prime factorization: 2 2 × 401
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand six hundred four
- Ordinal
- 1604th
- Roman numeral
- MDCIV
- Binary
- 11001000100
- Octal
- 3104
- Hexadecimal
- 0x644
- Base64
- BkQ=
- One's complement
- 63,931 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αχδʹ
- Mayan (base 20)
- 𝋤·𝋠·𝋤
- Chinese
- 一千六百零四
- Chinese (financial)
- 壹仟陸佰零肆
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,604 = 6
- e — Euler's number (e)
- Digit 1,604 = 2
- φ — Golden ratio (φ)
- Digit 1,604 = 2
- √2 — Pythagoras's (√2)
- Digit 1,604 = 9
- ln 2 — Natural log of 2
- Digit 1,604 = 2
- γ — Euler-Mascheroni (γ)
- Digit 1,604 = 7
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1604, here are decompositions:
- 3 + 1601 = 1604
- 7 + 1597 = 1604
- 37 + 1567 = 1604
- 61 + 1543 = 1604
- 73 + 1531 = 1604
- 151 + 1453 = 1604
- 157 + 1447 = 1604
- 181 + 1423 = 1604
Showing the first eight; more decompositions exist.
UTF-8 encoding: D9 84 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.68.
- Address
- 0.0.6.68
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.6.68
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1604 first appears in π at position 22,621 of the decimal expansion (the 22,621ordinal-suffix:st 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.