6434
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
- 9654
- Proper Divisor Sum (Aliquot Sum)
- 3220
- 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
- 3216
- Möbius Function
- 1
- Radical
- 6434
- 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
- 75
- 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
- Expansion of (1-x^8) / (1-x)^8.at n=8A008490
- a(n) = binomial(2n+1, n+1) - 1.at n=7A010763
- Central binomial coefficient - 1.at n=15A014495
- Number of compositions of n into 8 ordered relatively prime parts.at n=8A023033
- Number of connected functions on n points with a loop of length 6.at n=8A029869
- 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 80.at n=2A031578
- Sum of reciprocals of digits = 1.at n=36A037268
- Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n-1)/2.at n=15A047171
- T(n, k) = S(2*n + 1, n, k + 1) for 0<=k<=n and n >= 0, array S as in A050157.at n=34A050158
- T(n,k) = S(2n-1,n-1,k-1), 0<=k<=n, n >= 0, array S as in A050157.at n=43A050159
- Number of compositions of n into nonprime numbers.at n=23A052284
- a(n) is the number of divisors of n-th even perfect number.at n=17A061645
- Triangle of generalized Stirling numbers.at n=29A061691
- Harmonic mean of digits is 4.at n=38A062182
- Numbers m such that (1+i)^m - i is a Gaussian prime.at n=22A103329
- Positive integers n such that n^14 + 1 is semiprime (A001358).at n=32A104335
- Even elements of A085493.at n=10A106431
- Triangle, read by rows, such that row n equals the inverse binomial transform of row n of table A060543, where A060543(n,k) = C(n+n*k+k, n*k+k).at n=29A108290
- Triangle, read by rows, resulting from the matrix product of triangle A108267 with Pascal's triangle (A007318).at n=34A108291
- Shadow of Pi.at n=31A110621