6488
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 12180
- Proper Divisor Sum (Aliquot Sum)
- 5692
- 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
- 3240
- Möbius Function
- 0
- Radical
- 1622
- Omega Function (Ω)
- 4
- 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
- 137
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- Number of words of length n in a certain language.at n=38A005819
- Number of pairs of length n permutations achievable by double-ended priority queue.at n=4A007763
- Numbers k such that Fib(k) == 21 (mod k).at n=41A023179
- 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 19.at n=39A031517
- Numbers having three 8's in base 9.at n=16A043487
- Numbers n such that 1n1, 3n3, 7n7 and 9n9 are all primes.at n=13A059677
- Harmonic mean of digits is 6.at n=10A062184
- Maximum number of regions into which the plane is divided by n triangles.at n=47A077588
- Numbers whose set of base 9 digits is {0,8}.at n=13A097255
- Number of permutations of length n which avoid the patterns 321, 12354.at n=12A116846
- Expansion of (f(q) * f(q^3) / (f(-q) * f(-q^3)))^2 in powers of q where f() is a Ramanujan theta function.at n=13A123861
- 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), (0, 1, -1), (1, 0, 1), (1, 1, 0)}.at n=7A150412
- Number of distinct solutions of sum{i=1..2}(x(2i-1)*x(2i)) = 1 (mod n), with x() in 0..n-1.at n=39A180804
- Number of arrays of 3 integers in -n..n with sum zero and adjacent elements differing in absolute value.at n=46A202963
- Sum of smallest parts of all partitions of n into an even number of parts.at n=33A222045
- a(n) = 3*n^2 - 3*n + 2.at n=47A242658
- a(n) = PrimePi(4^n) - PrimePi(2^n).at n=8A248957
- Expansion of Product_{k>=1} (1 + 3*x^k) / (1 - x^k).at n=13A266821
- Number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 493", based on the 5-celled von Neumann neighborhood.at n=41A272543
- Preperiod (or threshold) of orbit of Post's {00, 1101} tag system applied to the word (100)^n, or -1 if this word has an unbounded trajectory.at n=40A284119