1,722
1,722 is a composite number, even, a calendar year.
Notable events — 1722 AD
- Mar 8 Persian Safavid rule collapses with the fall of Isfahan.
- Jun 4 Peter the Great launches the Russo-Persian War.
- Undated Easter Island is encountered by Europeans for the first time.
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
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 1722
- Ended on
-
Thursday
December 31, 1722
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Easter Sunday
-
April 5
Sunday, April 5, 1722
- Decade
-
1720s
1720–1729
- Century
-
18th century
1701–1800
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
304
304 years before 2026.
In other calendars
- Hebrew
-
5482 / 5483 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1134 / 1135 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Water zodiac:Tiger
Sexagenary cycle position 39 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2265 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1100 / 1101 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1714 / 1715 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1644 / 1643 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 12
- Digit product
- 28
- Digital root
- 3
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 2,271
- Recamán's sequence
- a(1,184) = 1,722
- Square (n²)
- 2,965,284
- Cube (n³)
- 5,106,219,048
- Divisor count
- 16
- σ(n) — sum of divisors
- 4,032
- φ(n) — Euler's totient
- 480
- Sum of prime factors
- 53
Primality
Prime factorization: 2 × 3 × 7 × 41
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand seven hundred twenty-two
- Ordinal
- 1722nd
- Roman numeral
- MDCCXXII
- Binary
- 11010111010
- Octal
- 3272
- Hexadecimal
- 0x6BA
- Base64
- Bro=
- One's complement
- 63,813 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵αψκβʹ
- Mayan (base 20)
- 𝋤·𝋦·𝋢
- Chinese
- 一千七百二十二
- Chinese (financial)
- 壹仟柒佰貳拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,722 = 6
- e — Euler's number (e)
- Digit 1,722 = 3
- φ — Golden ratio (φ)
- Digit 1,722 = 3
- √2 — Pythagoras's (√2)
- Digit 1,722 = 8
- ln 2 — Natural log of 2
- Digit 1,722 = 7
- γ — Euler-Mascheroni (γ)
- Digit 1,722 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1722, here are decompositions:
- 13 + 1709 = 1722
- 23 + 1699 = 1722
- 29 + 1693 = 1722
- 53 + 1669 = 1722
- 59 + 1663 = 1722
- 101 + 1621 = 1722
- 103 + 1619 = 1722
- 109 + 1613 = 1722
Showing the first eight; more decompositions exist.
UTF-8 encoding: DA BA (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.186.
- Address
- 0.0.6.186
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.6.186
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1722 first appears in π at position 6,273 of the decimal expansion (the 6,273ordinal-suffix:rd 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.