1,428
1,428 is a composite number, even, a calendar year.
Historical context — 1428 AD
Calendar year
Year 1428 (MCDXXVIII) was a leap year starting on Thursday of the Julian calendar.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →
Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
- 52
- Started on
-
Tuesday
January 1, 1428
- Ended on
-
Wednesday
December 31, 1428
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1420s
1420–1429
- Century
-
15th century
1401–1500
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
598
598 years before 2026.
In other calendars
- Hebrew
-
5188 / 5189 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
831 / 832 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Monkey
Sexagenary cycle position 45 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1971 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
806 / 807 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1420 / 1421 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1350 / 1349 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 15
- Digit product
- 64
- Digital root
- 6
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 8,241
- Recamán's sequence
- a(1,704) = 1,428
- Square (n²)
- 2,039,184
- Cube (n³)
- 2,911,954,752
- Divisor count
- 24
- σ(n) — sum of divisors
- 4,032
- φ(n) — Euler's totient
- 384
- Sum of prime factors
- 31
Primality
Prime factorization: 2 2 × 3 × 7 × 17
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand four hundred twenty-eight
- Ordinal
- 1428th
- Roman numeral
- MCDXXVIII
- Binary
- 10110010100
- Octal
- 2624
- Hexadecimal
- 0x594
- Base64
- BZQ=
- One's complement
- 64,107 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αυκηʹ
- Mayan (base 20)
- 𝋣·𝋫·𝋨
- Chinese
- 一千四百二十八
- Chinese (financial)
- 壹仟肆佰貳拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,428 = 1
- e — Euler's number (e)
- Digit 1,428 = 5
- φ — Golden ratio (φ)
- Digit 1,428 = 5
- √2 — Pythagoras's (√2)
- Digit 1,428 = 5
- ln 2 — Natural log of 2
- Digit 1,428 = 2
- γ — Euler-Mascheroni (γ)
- Digit 1,428 = 4
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1428, here are decompositions:
- 5 + 1423 = 1428
- 19 + 1409 = 1428
- 29 + 1399 = 1428
- 47 + 1381 = 1428
- 61 + 1367 = 1428
- 67 + 1361 = 1428
- 101 + 1327 = 1428
- 107 + 1321 = 1428
Showing the first eight; more decompositions exist.
UTF-8 encoding: D6 94 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.148.
- Address
- 0.0.5.148
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.5.148
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1428 first appears in π at position 3,757 of the decimal expansion (the 3,757ordinal-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.