4685
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5628
- Proper Divisor Sum (Aliquot Sum)
- 943
- 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
- 3744
- Möbius Function
- 1
- Radical
- 4685
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
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
- 59
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- Sum along upward diagonal of Pascal triangle from (but not including) halfway point.at n=19A010758
- Sum along upward diagonal of Pascal triangle from halfway point.at n=19A010759
- a(n) = floor(n*(n-1)*(n-2)/30).at n=53A011912
- T(n, 2n-9), T given by A027926.at n=9A027932
- a(n) = T(2n,n+2), T given by A027948.at n=5A027950
- Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 4.at n=38A031417
- Numbers whose maximal base-8 run length is 4.at n=12A037995
- Numbers having four 2's in base 5.at n=28A043360
- Numbers having four 1's in base 8.at n=8A043428
- a(n) = floor(47*(n-3/2)^(3/2)).at n=21A050256
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 11.at n=11A051976
- Partial sums of A014166.at n=9A053739
- Triangle T(n,k) of numbers of minimal 4-covers of an unlabeled n+4-set that cover k points of that set uniquely (k=4,..,n+4).at n=45A057967
- Number of anisohedral polyhexes with n cells.at n=14A075215
- Interprimes which are of the form s*prime, s=5.at n=14A075280
- ((Cumulative sum A000045) + (A000079)) - A092176.at n=13A093304
- Least k such that k*P(n)#/2 - 2 and k*P(n)#/2 + 2 are both primes, where P(i)= i-th prime, P(i)# = i-th primorial.at n=46A096937
- Symmetric triangle, read by rows, where row n equals the (n+1)-th differences of the crystal ball sequence for D_n lattice, for n>=0.at n=63A108558
- Symmetric triangle, read by rows, where row n equals the (n+1)-th differences of the crystal ball sequence for D_n lattice, for n>=0.at n=57A108558
- Composite numbers k such that k+d+1 is prime for all divisors d of k greater than 1.at n=32A120776