6218
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 9330
- Proper Divisor Sum (Aliquot Sum)
- 3112
- 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
- 3108
- Möbius Function
- 1
- Radical
- 6218
- 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
- 36
- 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
- Number of unlabeled connected strength 3 Eulerian graphs with n nodes.at n=4A007131
- Numbers k such that the continued fraction for sqrt(k) has period 29.at n=13A020368
- Convolution of composite numbers and odd numbers.at n=20A023650
- Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 9.at n=12A031422
- Numbers having four 4's in base 6.at n=18A043388
- Numbers whose base-5 representation contains exactly three 3's and two 4's.at n=19A045306
- Bessel function |Y_0(n)| is a monotonically decreasing positive sequence.at n=27A046963
- McKay-Thompson series of class 46C for the Monster group.at n=50A058689
- Number of partitions of n into distinct partition numbers.at n=21A068006
- a(n)=2*5^n-2^n.at n=5A083421
- Indices of primes in sequence defined by A(0) = 83, A(n) = 10*A(n-1) - 27 for n > 0.at n=6A101056
- A Catalan transform of Pell(n+1).at n=7A101850
- Least positive k such that k*n + 1 is a golden semiprime (A108540).at n=34A108200
- Smaller of two consecutive semiprimes with the same digital root.at n=41A118699
- Semiprimes that are the sum of 10 consecutive primes.at n=9A185347
- Monotonic ordering of nonnegative differences 3^i-7^j, for 40>= i>=0, j>=0.at n=21A192153
- Floor-Sqrt transform of numbers of A078678 (Grand Dyck paths with no zigzags).at n=20A192682
- Self-convolution square equals A195442.at n=4A195443
- Number of nX3 1..2 arrays with every element value z a city block distance of exactly z from another element value z.at n=4A209605
- Number of nX5 1..2 arrays with every element value z a city block distance of exactly z from another element value z.at n=2A209607