4389
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 7680
- Proper Divisor Sum (Aliquot Sum)
- 3291
- 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
- 1
- Radical
- 4389
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 4
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
- 139
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- yes
- 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
- Fermat coefficients.at n=8A000971
- Expansion of 1/((1-x)^4*(1+x)).at n=35A002623
- Number of n-step walks on square lattice in the first quadrant which finish at distance n-3 from the x-axis.at n=18A005564
- a(n) = 3*binomial(4*n-1, n-1)/(4*n-1).at n=5A006632
- Denominators of expansion of sinh x / sin x.at n=37A006656
- Denominators of expansion of sinh x / sin x.at n=47A006656
- a(n) = n*(4*n+1).at n=33A007742
- Coordination sequence T10 for Zeolite Code MFI.at n=42A008162
- Number of irreducible alternating Euler sums of depth 6 and weight 6+2n.at n=16A011796
- a(n) = floor(binomial(n,5)/6).at n=22A011843
- a(n) = n*(n+1)*(4*n+5)/6.at n=18A016061
- a(n) = 1*(n+1-1) + 2*(n+1-2) + ... + k*(n+1-k), where k = floor((n+1)/2).at n=35A023856
- a(n) = 1*(n+3-1) + 2*(n+3-2) + .... + k*(n+3-k), where k=floor((n+1)/2).at n=34A023857
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = (natural numbers >= 2).at n=34A024853
- Number of necklaces with 6 black beads and n-6 white beads.at n=17A032191
- Divisors = 1 (mod 4) of Descartes's 198585576189.at n=40A033870
- Decimal part of n-th root of a(n) starts with digit 2.at n=44A034079
- Odd numbers m such that there exists an even number k < m with phi(k) = phi(m).at n=42A036798
- Schoenheim bound L_1(n,6,5).at n=16A036833
- Molien series for 3-D group X1.at n=17A037240