3843
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 6448
- Proper Divisor Sum (Aliquot Sum)
- 2605
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 2160
- Möbius Function
- 0
- Radical
- 1281
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 144
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- a(n) = 4*n^2 - 1.at n=31A000466
- Double-bitters: only even length runs in binary expansion.at n=49A001196
- a(n) = (4*n+1)*(4*n+3).at n=15A001539
- Expansion of (1-x)/( (1+x)*(1-2*x)*(1-3*x)*(1-4*x)).at n=5A004057
- Related to series-parallel networks.at n=7A006350
- Coordination sequence T1 for Zeolite Code AFR.at n=47A008019
- Prefix (or Levenshtein) codes for natural numbers.at n=19A010097
- a(n) = floor( n*(n-1)*(n-2)/27 ).at n=48A011909
- Poincaré series [or Poincare series] for depths of roots in a certain root system.at n=10A019525
- Pseudoprimes to base 62.at n=30A020190
- Lucky numbers with smallest increasing gaps (upper terms).at n=15A031885
- Concatenation of n and n + 5 or {n,n+5}.at n=37A032610
- Lucky numbers that are decimal concatenations of n with n + 5.at n=3A032655
- a(n) = (n^2 - 1)*(n^2 - 3).at n=8A033596
- Divisors = 3 (mod 4) of Descartes's 198585576189.at n=37A033871
- Number of asymmetric connected graphs where every block is a complete graph.at n=14A035080
- Denominators of continued fraction convergents to sqrt(960).at n=5A042859
- Numbers whose base-4 representation contains exactly three 0's and three 3's.at n=6A045079
- Numbers whose base-5 representation contains exactly two 1's and three 3's.at n=14A045243
- Iterated procedure 'composite k added to sum of its prime factors reaches a prime' yields 9 skipped primes.at n=32A050776