16605
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 20
- Divisor Sum
- 30492
- Proper Divisor Sum (Aliquot Sum)
- 13887
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8640
- Möbius Function
- 0
- Radical
- 615
- Omega Function (Ω)
- 6
- 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
- 97
- 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
- Number of walks on cubic lattice.at n=44A005570
- Weight enumerator of [ 42,21,10 ] XQR code.at n=14A030646
- Multiplicity of highest weight (or singular) vectors associated with character chi_164 of Monster module.at n=40A034552
- Ordered factorizations with one level of parentheses indexed by prime signatures. A050354(A025487).at n=30A050355
- k such that k-th prime is of the form 2n^2 + 3n + 3.at n=40A096690
- a(n) = 11 + floor( (1 + Sum_{j=1..n-1} a(j)) / 2).at n=18A120139
- Weight distribution of [41,21,9] binary quadratic-residue (or QR) code.at n=13A146075
- Weight distribution of [41,21,9] binary quadratic-residue (or QR) code.at n=28A146075
- a(n) = 46*n^2 - 1.at n=18A158634
- Numbers of ways in which a unit disc can be dissected into 6n curvilinear triangles, at least one of which does not contain the center.at n=27A193362
- Coefficients of mock modular form H_1^(5) (divided by 2).at n=20A256054
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 435", based on the 5-celled von Neumann neighborhood.at n=27A272151
- Sum of all the parts in the partitions of n into 6 squarefree parts.at n=41A308903
- a(n) = n^2*(1+n)*(1+n^2)/4.at n=8A328994
- Square array read by antidiagonals: A(n,k) is the number of ordered solutions (x_1, x_2, ..., x_n) to equation phi(Product_{i=1..n} x_i) = k * Sum_{i=1..n} phi(x_i), or -1 if there are infinitely many solutions, n >= 1, k >= 1.at n=64A336710