6722
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
- 10086
- Proper Divisor Sum (Aliquot Sum)
- 3364
- 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
- 1
- Radical
- 6722
- 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
- 44
- 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/(1-x^7-x^8-x^9-x^10-x^11-x^12-x^13-x^14).at n=53A017863
- Numbers whose least quadratic nonresidue (A020649) is 11.at n=42A025024
- 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=21A031578
- Numbers k such that 263*2^k-1 is prime.at n=12A050890
- Number of partitions of an n-set into blocks of size > 4.at n=14A057814
- Number of right triangles of a given area required to form successively larger squares.at n=40A060626
- Numbers k such that 10*k-1, 10*k-3, 10*k-7 and 10*k-9 are all prime.at n=27A064975
- a(n) = sqrt(A076967(n)).at n=24A076968
- a(n) = ( A077059(n)^2 + A077060(n)^2 )^(1/3).at n=45A077061
- Convolution of the prime numbers with phi(n).at n=26A086734
- Double partial sums of (n * its dyadic valuation).at n=34A090889
- Row sums of triangle A091615.at n=10A091621
- McKay-Thompson series of class 18i for the Monster group.at n=54A112157
- Semiprimes n such that 3*n - 2 is a square.at n=40A112393
- Semiprimes in A056109.at n=21A113528
- Positions of 4's in A038800 with offset 1.at n=28A115095
- Number of rooted trees with total weight n, where the weight of a node at height k is k (with the root considered to be at level 0).at n=30A117356
- Semiprimes which are the sum of two pentagonal numbers (A000326) in exactly two different ways.at n=35A120536
- a(n) = smallest semiprime s such that s + n is the next semiprime and there is no prime between s and s + n.at n=6A133478
- Similar to A072921 but starting with 4.at n=34A152233