2006
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 8
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 3240
- Proper Divisor Sum (Aliquot Sum)
- 1234
- 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
- 928
- Möbius Function
- -1
- Radical
- 2006
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- 42
- 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
- Rotatable partitions.at n=34A002722
- 'Eban' numbers (the letter 'e' is banned!).at n=22A006933
- Coordination sequence T2 for Zeolite Code LTL.at n=33A008139
- Coordination sequence T4 for Zeolite Code LTN.at n=31A008143
- Coordination sequence T3 for Zeolite Code iRON.at n=31A009883
- Triangle of numbers of hybrid rooted trees (divided by Fibonacci numbers).at n=31A011274
- Numbers k such that sigma(k) = sigma(k+8).at n=12A015876
- Coordination sequence T1 for Zeolite Code CGF.at n=31A019451
- Coordination sequence T5 for Zeolite Code CGF.at n=31A019455
- Number of elementary edge-subgraphs in Moebius ladder M_n.at n=4A020879
- Number of strong restricted edge-subgraphs in Moebius ladder M_n.at n=3A020881
- Positive numbers k such that k and 3*k are anagrams in base 9 (written in base 9).at n=20A023080
- a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=a(2)=1 and a(3)=2.at n=16A024723
- Index of 10^n within the sequence of the numbers of the form 3^i*10^j.at n=43A025741
- Binomial transform of {1, primes}.at n=8A030015
- Numbers whose base-10 representation has 2 more 0's than 9's.at n=37A031498
- Number of partitions of n into parts not of the form 7k, 7k+3 or 7k-3. Also number of partitions such that the differences between parts at distance 2 are greater than 1.at n=38A035939
- Numbers whose base-2 and base-10 expansions have the same digit sum.at n=36A037308
- Denominators of continued fraction convergents to sqrt(553).at n=7A042059
- Numbers k such that 0 and 6 occur juxtaposed in the base-10 representation of k but not of k-1.at n=39A043221