6818
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 5
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 11712
- Proper Divisor Sum (Aliquot Sum)
- 4894
- 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
- 2916
- Möbius Function
- -1
- Radical
- 6818
- 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
- 137
- 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
- Series-parallel numbers.at n=8A000137
- Sum of 8th powers: 1^8 + 2^8 + ... + n^8.at n=3A000542
- a(n) = 1^n + 2^n + 3^n.at n=8A001550
- Numbers that are the sum of 6 positive 7th powers.at n=20A003373
- Numbers that are the sum of 3 nonzero 8th powers.at n=5A003381
- Numbers that are the sum of at most 3 nonzero 8th powers.at n=14A004876
- Numbers that are the sum of at most 4 nonzero 8th powers.at n=20A004877
- Numbers that are the sum of at most 5 nonzero 8th powers.at n=27A004878
- Numbers that are the sum of at most 6 nonzero 8th powers.at n=35A004879
- Expansion of Product_{k>=1} (1 - x^k)^(-k^8).at n=3A023877
- T(2n,n-2), T given by A026568.at n=6A026576
- 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 82.at n=8A031580
- Number of colors that can be mixed with n >= 0 units of yellow, blue, red.at n=35A048241
- Triangle T(n,k) giving number of 3 X k polyominoes with n cells (n >= 3, 1<=k<=n-2).at n=62A059683
- a(n) = Sum_{k=1..n-1} gcd(k,n)*a(k), a(1) = 1.at n=12A072979
- a(n) = 1^n + 4^n + 9^n.at n=4A074515
- Triangular array A065547 unsigned and transposed.at n=39A085707
- a(n) = floor(8^n/3^n).at n=9A094976
- Number of cubes that can be formed from the points of a cubical grid of n X n X n points.at n=11A098928
- Numbers k such that (3*2^k+1)^2-2 is prime.at n=16A100912