17927
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 22176
- Proper Divisor Sum (Aliquot Sum)
- 4249
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 14112
- Möbius Function
- -1
- Radical
- 17927
- Omega Function (Ω)
- 3
- 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
- 92
- 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
- Convolution of nonzero squares A000290 with themselves.at n=12A033455
- a(n) = n*(n - 1)*(n^2 + 1)/2.at n=14A071252
- Numbers k such that phi(k) divides sigma(k+1) - sigma(k).at n=43A072611
- One sixtieth the product of primitive Pythagorean triangles' sides whose odd values differ by 2.at n=6A081219
- Ordered product of the sides of primitive Pythagorean triangles divided by 60.at n=25A081752
- a(n) = n*(2*n^2 + n + 1)/2.at n=25A085786
- Numbers k such that k concatenated with k-7 gives the product of two numbers which differ by 9.at n=5A116114
- Numbers k such that k concatenated with k+1 gives the product of two numbers which differ by 7.at n=5A116167
- Numbers k such that k concatenated with k+7 gives the product of two numbers which differ by 5.at n=4A116207
- a(n) = numerator(Sum_{k=1..n} 1/(prime(k)-1)).at n=8A120271
- Numbers k such that k and k^2 use only the digits 1, 2, 3, 7 and 9.at n=18A136983
- Sum of the emergent parts of the partitions of n.at n=27A182709
- Number of 0..n arrays x(0..7) of 8 elements with zero 6th differences.at n=11A200086
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 195", based on the 5-celled von Neumann neighborhood.at n=30A270691