Number

393

393 is a composite number, odd, a calendar year.

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

Historical context — 393 AD

Calendar year

Year 393 (CCCXCIII) was a common year starting on Saturday of the Julian calendar.

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Historical context — 393 BC

Calendar year

Year 393 BC was a year of the pre-Julian Roman calendar.

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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: Friday
January 1, 393
Ended on: Friday
December 31, 393
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 390s
390–399
Century: 4th century
301–400
Millennium: 1st millennium
1–1000
Years ago: 1,633
1633 years before 2026.

In other calendars

Hebrew: 4153 / 4154 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Water zodiac:Snake
Sexagenary cycle position 30 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 936 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 385 / 386 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 315 / 314 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 15
Digit product: 81
Digital root: 6
Palindrome: Yes
Bit width: 9 bits
Recamán's sequence: a(2,466) = 393
Square (n²): 154,449
Cube (n³): 60,698,457
Divisor count: 4
σ(n) — sum of divisors: 528
φ(n) — Euler's totient: 260
Sum of prime factors: 134

Primality

Prime factorization: 3 × 131

Nearest primes: 389 (−4) · 397 (+4)

Divisors & multiples

All divisors (4)

1 · 3 · 131 · 393

Aliquot sum (sum of proper divisors): 135

Factor pairs (a × b = 393)

1 × 393

3 × 131

First multiples

393 · 786 (double) · 1,179 · 1,572 · 1,965 · 2,358 · 2,751 · 3,144 · 3,537 · 3,930

Sums & aliquot sequence

As consecutive integers: 196 + 197 130 + 131 + 132 63 + 64 + 65 + 66 + 67 + 68

Aliquot sequence: 393 → 135 → 105 → 87 → 33 → 15 → 9 → 4 → 3 → 1 → 0 — terminates at zero

Representations

In words: three hundred ninety-three
Ordinal: 393rd
Roman numeral: CCCXCIII
Binary: 110001001
Octal: 611
Hexadecimal: 0x189
Base64: AYk=
One's complement: 65,142 (16-bit)

In other bases

ternary (3) 112120

quaternary (4) 12021

quinary (5) 3033

senary (6) 1453

septenary (7) 1101

nonary (9) 476

undecimal (11) 328

duodecimal (12) 289

tridecimal (13) 243

tetradecimal (14) 201

pentadecimal (15) 1b3

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺
Greek (Milesian): τϟγʹ
Mayan (base 20): 𝋳·𝋭
Chinese: 三百九十三
Chinese (financial): 參佰玖拾參

In other modern scripts

Eastern Arabic ٣٩٣ Devanagari ३९३ Bengali ৩৯৩ Tamil ௩௯௩ Thai ๓๙๓ Tibetan ༣༩༣ Khmer ៣៩៣ Lao ໓໙໓ Burmese ၃၉၃

Digit at this position in famous constants

π — Pi (π): Digit 393 = 4
e — Euler's number (e): Digit 393 = 0
φ — Golden ratio (φ): Digit 393 = 5
√2 — Pythagoras's (√2): Digit 393 = 0
ln 2 — Natural log of 2: Digit 393 = 3
γ — Euler-Mascheroni (γ): Digit 393 = 6

Also seen as

Unicode codepoint

Latin Capital Letter African D

U+0189

Uppercase letter (Lu)

UTF-8 encoding: C6 89 (2 bytes).

Lookup U+0189 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000189

RGB(0, 1, 137)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.137.

Address: 0.0.1.137
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.137

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