7186
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
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 10782
- Proper Divisor Sum (Aliquot Sum)
- 3596
- 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
- 3592
- Möbius Function
- 1
- Radical
- 7186
- 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
- 31
- Smith Number
- yes
- 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 that are the sum of 2 positive 4th powers.at n=39A003336
- Percolation series for directed square lattice.at n=21A006462
- Numbers k such that the continued fraction for sqrt(k) has period 53.at n=13A020392
- Numerators of continued fraction convergents to sqrt(673).at n=4A042294
- Inverse Moebius transform of A000011 (starting at term 0).at n=19A054181
- Fourth column of A046741.at n=11A062124
- a(n) = 5^n + 9^n.at n=4A074618
- Numbers that can be represented as j^4 + k^4, with 0 < j < k, in exactly one way.at n=32A088687
- Number of self-avoiding walks of length n on an infinite triangular prism starting at the origin.at n=9A107069
- a(n) = prime(prime(A028815(n) - 1) - 1) - 1.at n=37A141136
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, -1), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.at n=8A148904
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (-1, 0, 1), (0, 1, 0), (1, 0, 0)}.at n=8A149921
- Similar to A072921 but starting with 4.at n=35A152233
- a(n) = 4*n^2 + 28*n + 10.at n=38A153644
- Array described in comments to A053482, here read by increasing antidiagonals. See comments below.at n=51A181783
- Quartan semiprimes: semiprimes of the form x^4 + y^4, x>0, y>0.at n=8A182277
- Number of binary words of length n containing no subword 100001.at n=13A210031
- Triangle of coefficients of polynomials v(n,x) jointly generated with A210862; see the Formula section.at n=39A210863
- Total area of the shadows of the three views of a three-dimensional version of the shell model of partitions with n shells.at n=19A210970
- Numbers of the form 3^j + 5^k, for j and k >= 0.at n=51A226809