4574
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 6864
- Proper Divisor Sum (Aliquot Sum)
- 2290
- 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
- 2286
- Möbius Function
- 1
- Radical
- 4574
- 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
- 121
- 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 T3 for Zeolite Code NON.at n=41A008214
- Coordination sequence for quartz.at n=38A008261
- Nine iterations of Reverse and Add are needed to reach a palindrome.at n=25A015990
- Numbers k such that the continued fraction for sqrt(k) has period 44.at n=36A020383
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 66.at n=20A031564
- Numbers k such that 87*2^k+1 is prime.at n=17A032393
- Multiplicity of highest weight (or singular) vectors associated with character chi_7 of Monster module.at n=41A034395
- Multiplicity of highest weight (or singular) vectors associated with character chi_80 of Monster module.at n=35A034468
- Unitary untouchable numbers: us(x) = n has no solution where us(x) (A063919) is the sum of the proper unitary divisors of x.at n=31A063948
- Numbers which need nine 'Reverse and Add' steps to reach a palindrome.at n=25A065214
- a(n) = floor(11^n/9^n).at n=42A094997
- a(n) = (1/3)*n^3 - n^2 - (1/3)*n - 1.at n=25A109620
- Start with 1 and repeatedly reverse the digits and add 53 to get the next term.at n=44A118150
- a(0)=a(1)=...=a(9)=1; a(n) = - a(n-1) + a(n-3) + a(n-4) + a(n-5) + a(n-6) + a(n-7) - a(n-9) - a(n-10).at n=61A125950
- Number of n-node triangulations of the nonorientable surface N_3 in which every node has degree >= 6.at n=5A129052
- Ulam's spiral (NNE spoke).at n=17A143861
- 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, 0), (-1, 1, 1), (1, 0, 0)}.at n=9A148549
- 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, -1, 1), (-1, 0, -1), (1, -1, 1), (1, 1, 0)}.at n=8A149099
- Number of solutions of +-1+-2^3+-3^3..+-n^3=0.at n=26A158118
- Partial sums of [A052938(n)^2].at n=34A162899