7226
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 10842
- Proper Divisor Sum (Aliquot Sum)
- 3616
- 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
- 3612
- Möbius Function
- 1
- Radical
- 7226
- 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
- 119
- 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
- Coordination sequence for FeS2-Pyrite, Fe position.at n=39A009957
- Least k with A025485(k) = n.at n=6A025486
- Numerators of continued fraction convergents to sqrt(803).at n=5A042548
- Centered square numbers: a(n) = 4*n^2 + 4*n + 2.at n=42A069894
- Expansion of (1+x^4*C^3)*C^4, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.at n=7A071753
- Solution to the non-squashing boxes problem (version 2).at n=25A089055
- Numbers in increasing order such that successive sums are squares and successive differences are squarefree.at n=46A090956
- Triangle read by rows: T(n,k) is the number of Schroeder paths of length 2n having exactly k down steps hitting the x-axis.at n=50A101275
- Conjectured numbers n such that the trajectory of n as defined in A003508 is unique.at n=31A105233
- a(n) = Sum_{k <= n/2 } k*binomial(n-2k, 3k).at n=18A137359
- Semiprimes of the form k^2+1.at n=38A144255
- a(n) = 81*n^2 - 90*n + 26.at n=10A154295
- a(n) = 289n + 1.at n=24A158255
- Number of nonempty subsets of {1, 2, ..., n} with <=7 pairwise coprime elements.at n=22A187268
- Semiprimes which are one more than a perfect power.at n=44A189047
- a(n) = (n^3 - 2*n^2 + 3*n + 2)/2.at n=25A189890
- Number of lower triangles of a 3 X 3 0..n array with no element differing from any of its horizontal or vertical neighbors by more than one.at n=42A194932
- Conjectured number of digits in highest power of n with no four consecutive identical digits.at n=37A216142
- Primitive numbers in A229304.at n=39A229308
- Numbers k such that 3*R_(k+2) + 4*10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=15A257025