6027
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 9576
- Proper Divisor Sum (Aliquot Sum)
- 3549
- 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
- 3360
- Möbius Function
- 0
- Radical
- 861
- Omega Function (Ω)
- 4
- 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
- 186
- 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
- no
- Odd
- yes
Appears in sequences
- Number of 3rd-order maximal independent sets in cycle graph.at n=40A007387
- a(n) = floor( n*(n-1)*(n-2)/22 ).at n=52A011904
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly nine 1's.at n=18A020445
- a(n) is least k such that k and 5k are anagrams in base n (written in base 10).at n=36A023097
- 7 times triangular numbers: 7*n*(n+1)/2.at n=41A024966
- a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026725.at n=6A027208
- Numbers k that divide the (right) concatenation of all numbers <= k written in base 7 (most significant digit on left).at n=44A029452
- Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= n/3.at n=20A047195
- Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n+1)/3.at n=20A048040
- Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n+2)/3.at n=20A048073
- Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 22 (most significant digit on right).at n=28A061951
- Numbers k that divide phi(k)^2 + sigma(k)^2.at n=22A068484
- Table T(n,k) by antidiagonals: T(n,k) = number of partitions of n balls of k colors.at n=52A075196
- Triangle, read by rows, where the n-th row lists the (2n+1) coefficients of (1 + x + 4x^2)^n.at n=55A084604
- Number of numbers with 6 decimal digits and sum of digits = n.at n=12A090581
- Number of numbers with 6 decimal digits and sum of digits = n.at n=41A090581
- E.g.f. exp(x)*BesselI(1,4*x)/2.at n=7A098520
- a(n) is the least k such that k*(prime(n)#)^prime(n) - 1 is prime, where prime(n)# is the n-th primorial.at n=47A101047
- Inverse of a generalized Stirling number triangle of first kind.at n=61A105794
- Partial sums of A102540 (primes that are not Chen primes).at n=25A115606