1006
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 7
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1512
- Proper Divisor Sum (Aliquot Sum)
- 506
- 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
- 502
- Möbius Function
- 1
- Radical
- 1006
- 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
- 67
- 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
- Numbers that are the sum of 7 positive 5th powers.at n=27A003352
- Number of Hamiltonian paths in P_4 X P_n.at n=4A003695
- Number of Hamiltonian paths in P_5 X P_n.at n=3A003778
- Coefficients of modular function G_2(tau).at n=41A005760
- Number of compositions (ordered partitions) of n into squares.at n=22A006456
- Shifts left under XOR-convolution with itself.at n=8A007462
- Coordination sequence T2 for Zeolite Code AET.at n=22A008008
- Coordination sequence T1 for Zeolite Code AFG.at n=22A008012
- Coordination sequence T2 for Zeolite Code APD.at n=21A008035
- Coordination sequence T1 for Zeolite Code EAB.at n=23A008082
- Coordination sequence T2 for Zeolite Code EMT.at n=26A008087
- Coordination sequence T8 for Zeolite Code EUO.at n=20A008103
- Coordination sequence T1 for Zeolite Code LOS.at n=22A008132
- Coordination sequence T7 for Zeolite Code MTW.at n=21A008202
- Numbers k such that phi(k) + 3 | sigma(k + 3).at n=47A015782
- Numbers k such that phi(k + 10) | sigma(k).at n=52A015830
- Numbers k such that the continued fraction for sqrt(k) has period 48.at n=2A020387
- Sequence and first differences include all positive integers except 2.at n=39A022443
- Place where n-th 1 occurs in A023131.at n=26A022793
- a(n) = F(n+2) + c(n) where F(k) is k-th Fibonacci number and c(n) is n-th number that is 1 or is a non-Fibonacci number.at n=13A022800