6718
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 10080
- Proper Divisor Sum (Aliquot Sum)
- 3362
- 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
- 3358
- Möbius Function
- 1
- Radical
- 6718
- 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
- 137
- Smith Number
- yes
- 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
- Numbers k such that the continued fraction for sqrt(k) has period 80.at n=21A020419
- Numbers whose least quadratic nonresidue (A020649) is 11.at n=40A025024
- Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 14 (most significant digit on right).at n=17A029507
- 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=20A031578
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 38 ones.at n=36A031806
- Number of subgroups of the group GL(2,Z_n) of invertible 2 X 2 matrices mod n (sequence A000252).at n=9A066514
- Numbers n such that sum of n-th and (n+1)-st semiprimes is a square=q^2.at n=40A109311
- Number of 2-anisohedral polyhexes of order n.at n=16A120117
- Triangle read by rows: row n is the first row of the matrix M[n]^(n-1), where M[n] is the n X n tridiagonal matrix with main diagonal (2,4,4,...) and super- and subdiagonals (1,1,1,...).at n=31A124575
- a(0)=0, a(1)=1; and a(n) = a(n-1) + a(a(n-1) mod n) for n>=2.at n=43A125204
- Triangle read by rows: T(n,k) = T(n-1,k-1) +T(n-1,k) +n*(n-1)*T(n-2,k-1) for n>4 and 1<=k<=n.at n=23A153592
- Triangle read by rows: T(n,k) = T(n-1,k-1) +T(n-1,k) +n*(n-1)*T(n-2,k-1) for n>4 and 1<=k<=n.at n=25A153592
- a(n) = n^3 + 73*n^2 + n + 67.at n=9A163303
- Values k: A165495(k) is odd.at n=38A165496
- Numbers with distinct digits appearing in partition of decimal expansion of square root of 2. (A002193).at n=12A167834
- Triangle T(n,k) = 1 - A176304(k) - A176304(n-k) + A176304(n), read by rows.at n=30A176306
- Triangle T(n,k) = 1 - A176304(k) - A176304(n-k) + A176304(n), read by rows.at n=33A176306
- Second row of array defined in A056230.at n=9A200379
- Number of partitions of 0 having positive part-sum <= n.at n=10A209536
- Lengths of binary representations of prime Fibonacci numbers.at n=25A215367