9490
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 18648
- Proper Divisor Sum (Aliquot Sum)
- 9158
- 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
- 3456
- Möbius Function
- 1
- Radical
- 9490
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 4
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
- 52
- 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
- Base-8 palindromes that start with 2.at n=38A043022
- Numbers having four 2's in base 8.at n=21A043432
- Triangle T(n,k) giving number of fixed 3 X k polyominoes with n cells (n >= 3, 1<=k<=n-2).at n=52A059679
- Non-palindromic number and its reversal are both multiples of 13.at n=30A062912
- Antidiagonal sums of the slanted Catalan convolution table A100247.at n=13A100249
- A Catalan transform of the Fibonacci numbers.at n=9A109262
- Riordan array (1/(1 - x*c(x) - x^2*c(x)^2), x*c(x)) where c(x) is the g.f. of A000108.at n=46A109267
- Zero followed by partial sums of A133405.at n=12A133409
- Numbers k such that k and k^2 use only the digits 0, 1, 4, 6 and 9.at n=21A136862
- a(n) = 250*n - 10.at n=37A154378
- a(n) = 36*n^2 - 55*n + 21.at n=16A157262
- a(n) = A030068(4n+3).at n=39A169740
- Primitive numbers n such that 1/n is in the Cantor set.at n=26A173793
- Irregular triangle in which row n has primitive numbers k such that 1/k is in the Cantor set and the fraction 1/k has period n.at n=24A173800
- Riordan array ((1-x^2c(x)^2)/(1-xc(x)-x^2c(x)^2),xc(x)), c(x) the g.f. of A000108.at n=45A174302
- 1/16 the number of (n+1) X (n+1) 0..3 arrays with all 2 X 2 subblocks having the same four values.at n=9A184030
- Number of subsets of {1, 2, ..., n} containing n and having <=6 pairwise coprime elements.at n=44A186990
- Inverse permutation to A190126.at n=30A190127
- Number of (n+1) X 2 0..1 arrays with the permanents of 2 X 2 subblocks nondecreasing rightwards and downwards.at n=6A204716
- Number of (n+1)X8 0..1 arrays with the permanents of 2X2 subblocks nondecreasing rightwards and downwards.at n=0A204722