Number

425

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

Arithmetic Number Deficient Number Odious Number Pentagonal Pernicious Number Recamán's Sequence Year

Historical context — 425 AD

Calendar year

Year 425 (CDXXV) was a common year starting on Thursday of the Julian calendar.

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Historical context — 425 BC

Calendar year

Year 425 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: Wednesday
January 1, 425
Ended on: Wednesday
December 31, 425
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 420s
420–429
Century: 5th century
401–500
Millennium: 1st millennium
1–1000
Years ago: 1,601
1601 years before 2026.

In other calendars

Hebrew: 4185 / 4186 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Wood zodiac:Ox
Sexagenary cycle position 2 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 968 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 417 / 418 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 347 / 346 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 11
Digit product: 40
Digital root: 2
Palindrome: No
Bit width: 9 bits
Reversed: 524
Recamán's sequence: a(466) = 425
Square (n²): 180,625
Cube (n³): 76,765,625
Divisor count: 6
σ(n) — sum of divisors: 558
φ(n) — Euler's totient: 320
Sum of prime factors: 27

Primality

Prime factorization: 5 ² × 17

Nearest primes: 421 (−4) · 431 (+6)

Divisors & multiples

All divisors (6)

1 · 5 · 17 · 25 · 85 · 425

Aliquot sum (sum of proper divisors): 133

Factor pairs (a × b = 425)

1 × 425

5 × 85

17 × 25

First multiples

425 · 850 (double) · 1,275 · 1,700 · 2,125 · 2,550 · 2,975 · 3,400 · 3,825 · 4,250

Sums & aliquot sequence

As a sum of two squares: 5² + 20² = 8² + 19² = 13² + 16²

As consecutive integers: 212 + 213 83 + 84 + 85 + 86 + 87 38 + 39 + … + 47 17 + 18 + … + 33

Aliquot sequence: 425 → 133 → 27 → 13 → 1 → 0 — terminates at zero

Representations

In words: four hundred twenty-five
Ordinal: 425th
Roman numeral: CDXXV
Binary: 110101001
Octal: 651
Hexadecimal: 0x1A9
Base64: Aak=
One's complement: 65,110 (16-bit)

In other bases

ternary (3) 120202

quaternary (4) 12221

quinary (5) 3200

senary (6) 1545

septenary (7) 1145

nonary (9) 522

undecimal (11) 357

duodecimal (12) 2b5

tridecimal (13) 269

tetradecimal (14) 225

pentadecimal (15) 1d5

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): υκεʹ
Mayan (base 20): 𝋡·𝋡·𝋥
Chinese: 四百二十五
Chinese (financial): 肆佰貳拾伍

In other modern scripts

Eastern Arabic ٤٢٥ Devanagari ४२५ Bengali ৪২৫ Tamil ௪௨௫ Thai ๔๒๕ Tibetan ༤༢༥ Khmer ៤២៥ Lao ໔໒໕ Burmese ၄၂၅

Digit at this position in famous constants

π — Pi (π): Digit 425 = 1
e — Euler's number (e): Digit 425 = 7
φ — Golden ratio (φ): Digit 425 = 0
√2 — Pythagoras's (√2): Digit 425 = 5
ln 2 — Natural log of 2: Digit 425 = 9
γ — Euler-Mascheroni (γ): Digit 425 = 3

Also seen as

Unicode codepoint

Latin Capital Letter Esh

U+01A9

Uppercase letter (Lu)

UTF-8 encoding: C6 A9 (2 bytes).

Lookup U+01A9 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0001A9

RGB(0, 1, 169)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.169.

Address: 0.0.1.169
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.169

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

NANP area code 425

The number 425 is an active NANP area code (North American Numbering Plan).

Primary area: Bellevue / Everett
Region: Washington
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 425 ↗