number.wiki
Number

3,821

3,821 is a prime, odd.

Deficient Number Prime Squarefree Twin Prime

Properties

Parity
Odd
Digit count
4
Digit sum
14
Digital root
5
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
3,822

Primality

3,821 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 3821
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 3,821)
1 × 3821
First multiples
3,821 · 7,642 · 11,463 · 15,284 · 19,105 · 22,926 · 26,747 · 30,568 · 34,389 · 38,210

Representations

In words
three thousand eight hundred twenty-one
Ordinal
3821st
Roman numeral
MMMDCCCXXI
Binary
111011101101
Octal
7355
Hexadecimal
EED

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 3,803 (gap of 18)
  • Next prime: 3,823 (gap of 2)

Pair status: twin with 3823.

Hex color
#000EED
RGB(0, 14, 237)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.14.237.