9910
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 17856
- Proper Divisor Sum (Aliquot Sum)
- 7946
- 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
- 3960
- Möbius Function
- -1
- Radical
- 9910
- 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
- 73
- 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
- yes
- Odd
- no
Appears in sequences
- Number of fixed polyominoes with n cells.at n=9A001168
- Number of Twopins positions.at n=22A005690
- Number of paraffins.at n=27A006001
- Erroneous version of A001168.at n=8A014559
- Revert transform of (1 + x - 2x^2 + x^3)/(1 + 2x).at n=11A049144
- Treated as strings, n begins with Floor(sqrt(n)).at n=33A069086
- a(n) = a(n-1) + R(a(n-2)) + R(a(n-3)) + R(a(n-4)) where a(1) = a(2) = a(3) = a(4) = 1 and R(n) (A004086) is the reverse of n.at n=13A074865
- a(n) = (n^3 + 24*n^2 + 65*n + 36)/6.at n=32A087863
- Integers n such that 10^n-59 is prime.at n=18A108506
- A (twin's digits) self-disappearing sequence.at n=46A108988
- A Jacobi transform of 10^n.at n=4A110251
- Number of fusenes with 24 hexagons, C_(2v) symmetry and containing n carbon atoms.at n=12A123606
- Numbers k such that k and k^2 use only the digits 0, 1, 2, 8 and 9.at n=43A136835
- a(n) + a(n+1) + a(n+2) = n^3.at n=32A152728
- Number of fixed polyominoes that can produce a repeating phenotype with 1, 2, or 4 90-degree turns.at n=26A202015
- Number of fixed polyominoes with 2n-1 cells.at n=4A210987
- Number of 2-matchings of the n-th centered square grid graph.at n=6A344679
- Numbers that are the sum of ten fourth powers in exactly nine ways.at n=41A345861
- Integers m that divide the sum of values d*p < m, where d is a divisor of m, p is a prime, and d*p does not divide m.at n=12A350878
- Square array read by descending antidiagonals: A(n,k) is the number of fixed n-dimensional polyominoes of size k.at n=46A385291