Live analysis

7,421

7,421 is a composite number, odd.

This number doesn't have a permanent NumberWiki page yet — what you see below is computed live. Pages get added to the permanent index when they're notable (years, primes, curated, etc.).

7,421 (seven thousand four hundred twenty-one) is an odd 4-digit number. It is a composite number with 4 divisors, and factors as 41 × 181. Written other ways, in hexadecimal, 0x1CFD.

Arithmetic Number Cube-Free Deficient Number Descending Digits Evil Number Happy Number Recamán's Sequence Semiprime Squarefree

Interestingness

★ ★ ★ ★ ☆

7 notable facts · grade B

7,409 7,410 7,411 7,412 7,413 7,414 7,415 7,416 7,417 7,418 7,419 7,420 7,421 7,422 7,423 7,424 7,425 7,426 7,427 7,428 7,429 7,430 7,431 7,432 7,433

less more

Properties

Parity: Odd
Digit count: 4
Digit sum: 14
Digit product: 56
Digital root: 5
Palindrome: No
Bit width: 13 bits
Reversed: 1,247
Recamán's sequence: a(11,185) = 7,421
Square (n²): 55,071,241
Cube (n³): 408,683,679,461
Divisor count: 4
σ(n) — sum of divisors: 7,644
φ(n) — Euler's totient: 7,200
Sum of prime factors: 222

Primality

Prime factorization: 41 × 181

Nearest primes: 7,417 (−4) · 7,433 (+12)

Divisors & multiples

All divisors (4)

1 · 41 · 181 · 7421

Aliquot sum (sum of proper divisors): 223

Factor pairs (a × b = 7,421)

1 × 7421

41 × 181

First multiples

7,421 · 14,842 (double) · 22,263 · 29,684 · 37,105 · 44,526 · 51,947 · 59,368 · 66,789 · 74,210

Sums & aliquot sequence

As a sum of two squares: 5² + 86² = 14² + 85²

As consecutive integers: 3,710 + 3,711 161 + 162 + … + 201 50 + 51 + … + 131

Aliquot sequence: 7,421 → 223 → 1 → 0 — terminates at zero

Continued fraction of √n

√7,421 = [86; (6, 1, 7, 1, 3, 8, 2, 1, 3, 1, 42, 3, 2, 34, 34, 2, 3, 42, 1, 3, 1, 2, 8, 3, …)]

Period length 29 — the block in parentheses repeats forever.

Representations

In words: seven thousand four hundred twenty-one
Ordinal: 7421st
Binary: 1110011111101
Octal: 16375
Hexadecimal: 0x1CFD
Base64: HP0=
One's complement: 58,114 (16-bit)
Scientific notation: 7.421 × 10³
As a duration: 7,421 s = 2 hours, 3 minutes, 41 seconds

In other bases

ternary (3) 101011212

quaternary (4) 1303331

quinary (5) 214141

senary (6) 54205

septenary (7) 30431

nonary (9) 11155

undecimal (11) 5637

duodecimal (12) 4365

tridecimal (13) 34bb

tetradecimal (14) 29c1

pentadecimal (15) 22eb

As an angle

7,421° = 20 × 360° + 221°

221° ≈ 3.857 rad

Compass bearing: SW (southwest)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒁹𒁹 𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓏺
Greek (Milesian): ͵ζυκαʹ
Mayan (base 20): 𝋲·𝋫·𝋡
Chinese: 七千四百二十一
Chinese (financial): 柒仟肆佰貳拾壹

In other modern scripts

Eastern Arabic ٧٤٢١ Devanagari ७४२१ Bengali ৭৪২১ Tamil ௭௪௨௧ Thai ๗๔๒๑ Tibetan ༧༤༢༡ Khmer ៧៤២១ Lao ໗໔໒໑ Burmese ၇၄၂၁

Digit at this position in famous constants

π — Pi (π): Digit 7,421 = 6
e — Euler's number (e): Digit 7,421 = 1
φ — Golden ratio (φ): Digit 7,421 = 9
√2 — Pythagoras's (√2): Digit 7,421 = 2
ln 2 — Natural log of 2: Digit 7,421 = 5
γ — Euler-Mascheroni (γ): Digit 7,421 = 0

Also seen as

Hex color

#001CFD

RGB(0, 28, 253)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.28.253.

Address: 0.0.28.253
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.28.253

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

Musical pitch

Heard as a frequency, 7,421 Hz is closest to:

Concert pitch (A4 = 440 Hz): A♯8 (7458.6 Hz, -9¢)
Scientific pitch (C4 = 256 Hz): A♯8 (7298.2 Hz, +29¢)
Baroque pitch (A4 = 415 Hz): B8 (7453.1 Hz, -7¢)

Position in π

The digit sequence 7421 first appears in π at position 6,794 of the decimal expansion (the 6,794ordinal-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 7421 on Pi Search ↗