Number

623

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

Arithmetic Number Deficient Number Happy Number Odious Number Pernicious Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 623 AD

Calendar year

Year 623 (DCXXIII) was a common year starting on Saturday of the Julian calendar.

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Historical context — 623 BC

Decade

This article concerns the period 629 BC – 620 BC.

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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: Wednesday
January 1, 623
Ended on: Wednesday
December 31, 623
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 620s
620–629
Century: 7th century
601–700
Millennium: 1st millennium
1–1000
Years ago: 1,403
1403 years before 2026.

In other calendars

Hebrew: 4383 / 4384 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 1 / 2 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Water zodiac:Goat
Sexagenary cycle position 20 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1166 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 1 / 2 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 615 / 616 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 545 / 544 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 11
Digit product: 36
Digital root: 2
Palindrome: No
Bit width: 10 bits
Reversed: 326
Recamán's sequence: a(8,894) = 623
Square (n²): 388,129
Cube (n³): 241,804,367
Divisor count: 4
σ(n) — sum of divisors: 720
φ(n) — Euler's totient: 528
Sum of prime factors: 96

Primality

Prime factorization: 7 × 89

Nearest primes: 619 (−4) · 631 (+8)

Divisors & multiples

All divisors (4)

1 · 7 · 89 · 623

Aliquot sum (sum of proper divisors): 97

Factor pairs (a × b = 623)

1 × 623

7 × 89

First multiples

623 · 1,246 (double) · 1,869 · 2,492 · 3,115 · 3,738 · 4,361 · 4,984 · 5,607 · 6,230

Sums & aliquot sequence

As consecutive integers: 311 + 312 86 + 87 + … + 92 38 + 39 + … + 51

Aliquot sequence: 623 → 97 → 1 → 0 — terminates at zero

Representations

In words: six hundred twenty-three
Ordinal: 623rd
Roman numeral: DCXXIII
Binary: 1001101111
Octal: 1157
Hexadecimal: 0x26F
Base64: Am8=
One's complement: 64,912 (16-bit)

In other bases

ternary (3) 212002

quaternary (4) 21233

quinary (5) 4443

senary (6) 2515

septenary (7) 1550

nonary (9) 762

undecimal (11) 517

duodecimal (12) 43b

tridecimal (13) 38c

tetradecimal (14) 327

pentadecimal (15) 2b8

Historical numeral systems

Babylonian (base 60): 𒌋 𒌋𒌋𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺
Greek (Milesian): χκγʹ
Mayan (base 20): 𝋡·𝋫·𝋣
Chinese: 六百二十三
Chinese (financial): 陸佰貳拾參

In other modern scripts

Eastern Arabic ٦٢٣ Devanagari ६२३ Bengali ৬২৩ Tamil ௬௨௩ Thai ๖๒๓ Tibetan ༦༢༣ Khmer ៦២៣ Lao ໖໒໓ Burmese ၆၂၃

Digit at this position in famous constants

π — Pi (π): Digit 623 = 7
e — Euler's number (e): Digit 623 = 0
φ — Golden ratio (φ): Digit 623 = 9
√2 — Pythagoras's (√2): Digit 623 = 5
ln 2 — Natural log of 2: Digit 623 = 8
γ — Euler-Mascheroni (γ): Digit 623 = 3

Also seen as

Unicode codepoint

Latin Small Letter Turned M

U+026F

Lowercase letter (Ll)

UTF-8 encoding: C9 AF (2 bytes).

Lookup U+026F on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00026F

RGB(0, 2, 111)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.111.

Address: 0.0.2.111
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.111

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

NANP area code 623

The number 623 is an active NANP area code (North American Numbering Plan).

Primary area: Western suburbs of Phoenix
Region: Arizona
Country: United States

Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.

Look up area code 623 ↗