16862
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 25296
- Proper Divisor Sum (Aliquot Sum)
- 8434
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8430
- Möbius Function
- 1
- Radical
- 16862
- 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
- 97
- 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
- yes
- Odd
- no
Appears in sequences
- Numbers k such that 255*2^k+1 is prime.at n=39A032504
- Number of partitions of n with equal number of parts congruent to each of 0 and 2 (mod 5).at n=46A035553
- Number of signed permutations of length n avoiding (-2, 1) and (2, -1).at n=7A193763
- Number of non-intersecting unit cubes regularly packed into the tetrahedron of edge length n.at n=53A219965
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 201", based on the 5-celled von Neumann neighborhood.at n=30A270722
- E.g.f.: -log(1 - x) / ((1 - x) * (1 + log(1 - x))).at n=6A331798
- Product_{n>=1} 1 / (1 - a(n)*x^n/n!) = 1 + log(1 + x).at n=6A348205
- Product_{n>=1} (1 + a(n)*x^n/n!) = 1 + log(1 + x).at n=6A348206
- Product_{n>=1} (1 + x^n)^(a(n)/n!) = 1 + log(1 + x).at n=6A352404
- Product_{n>=1} 1 / (1 - x^n)^(a(n)/n!) = 1 + log(1 + x).at n=6A352691
- Number of subsets of {1..n} such that a unique set can be obtained by choosing a different binary index of each element.at n=21A370638