Number

1,405

1,405 is a composite number, odd, a calendar year.

Arithmetic Number Deficient Number Evil Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 1405 AD

Calendar year

Year 1405 (MCDV) was a common year starting on Thursday of the Julian calendar, the 1405th year of the Common Era (CE) and Anno Domini (AD) designations, the 405th year of the 2nd millennium, the 5th year of the 15th century, and the 6th year of the 1400s decade.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

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: Tuesday
January 1, 1405
Ended on: Tuesday
December 31, 1405
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 1400s
1400–1409
Century: 15th century
1401–1500
Millennium: 2nd millennium
1001–2000
Years ago: 621
621 years before 2026.

In other calendars

Hebrew: 5165 / 5166 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 807 / 808 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Wood zodiac:Rooster
Sexagenary cycle position 22 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1948 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 783 / 784 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 1397 / 1398 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 1327 / 1326 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 4
Digit sum: 10
Digit product: 0
Digital root: 1
Palindrome: No
Bit width: 11 bits
Reversed: 5,041
Recamán's sequence: a(8,318) = 1,405
Square (n²): 1,974,025
Cube (n³): 2,773,505,125
Divisor count: 4
σ(n) — sum of divisors: 1,692
φ(n) — Euler's totient: 1,120
Sum of prime factors: 286

Primality

Prime factorization: 5 × 281

Nearest primes: 1,399 (−6) · 1,409 (+4)

Divisors & multiples

All divisors (4)

1 · 5 · 281 · 1405

Aliquot sum (sum of proper divisors): 287

Factor pairs (a × b = 1,405)

1 × 1405

5 × 281

First multiples

1,405 · 2,810 (double) · 4,215 · 5,620 · 7,025 · 8,430 · 9,835 · 11,240 · 12,645 · 14,050

Sums & aliquot sequence

As a sum of two squares: 6² + 37² = 26² + 27²

As consecutive integers: 702 + 703 279 + 280 + 281 + 282 + 283 136 + 137 + … + 145

Aliquot sequence: 1,405 → 287 → 49 → 8 → 7 → 1 → 0 — terminates at zero

Representations

In words: one thousand four hundred five
Ordinal: 1405th
Roman numeral: MCDV
Binary: 10101111101
Octal: 2575
Hexadecimal: 0x57D
Base64: BX0=
One's complement: 64,130 (16-bit)

In other bases

ternary (3) 1221001

quaternary (4) 111331

quinary (5) 21110

senary (6) 10301

septenary (7) 4045

nonary (9) 1831

undecimal (11) 1068

duodecimal (12) 991

tridecimal (13) 841

tetradecimal (14) 725

pentadecimal (15) 63a

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓆼𓍢𓍢𓍢𓍢𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ͵αυεʹ
Mayan (base 20): 𝋣·𝋪·𝋥
Chinese: 一千四百零五
Chinese (financial): 壹仟肆佰零伍

In other modern scripts

Eastern Arabic ١٤٠٥ Devanagari १४०५ Bengali ১৪০৫ Tamil ௧௪௦௫ Thai ๑๔๐๕ Tibetan ༡༤༠༥ Khmer ១៤០៥ Lao ໑໔໐໕ Burmese ၁၄၀၅

Digit at this position in famous constants

π — Pi (π): Digit 1,405 = 2
e — Euler's number (e): Digit 1,405 = 5
φ — Golden ratio (φ): Digit 1,405 = 3
√2 — Pythagoras's (√2): Digit 1,405 = 3
ln 2 — Natural log of 2: Digit 1,405 = 4
γ — Euler-Mascheroni (γ): Digit 1,405 = 3

Also seen as

Unicode codepoint

Armenian Small Letter Seh

U+057D

Lowercase letter (Ll)

UTF-8 encoding: D5 BD (2 bytes).

Lookup U+057D on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00057D

RGB(0, 5, 125)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.125.

Address: 0.0.5.125
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.5.125

Unspecified address (0.0.0.0/8) — "this network" placeholder.

Position in π

The digit sequence 1405 first appears in π at position 8,245 of the decimal expansion (the 8,245ordinal-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.

Look up 1405 on Pi Search ↗