5945
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 7560
- Proper Divisor Sum (Aliquot Sum)
- 1615
- 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
- 4480
- Möbius Function
- -1
- Radical
- 5945
- Omega Function (Ω)
- 3
- 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
- 49
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers that are the sum of 2 nonzero squares in exactly 4 ways.at n=28A025287
- Numbers that are the sum of 2 nonzero squares in 4 or more ways.at n=29A025295
- Numbers that are the sum of 2 distinct nonzero squares in exactly 4 ways.at n=28A025305
- Numbers that are the sum of 2 distinct nonzero squares in 4 or more ways.at n=29A025314
- a(n) = dot_product(n,n-1,...2,1)*(5,6,...,n,1,2,3,4).at n=24A026060
- a(n) = Sum_{k=0..floor(n/2)} A026626(n-k, k).at n=18A026636
- Number of ways to partition n labeled elements into pie slices of at least 2 elements allowing the pie to be turned over.at n=9A032265
- Numbers whose set of base-7 digits is {2,3}.at n=38A032807
- Sets of 4 consecutive numbers with equal number of divisors.at n=14A039665
- Numbers whose base-7 representation contains exactly four 2's.at n=22A043404
- Final members of groups in A076105.at n=22A076102
- Main diagonal of square array A082025.at n=41A082189
- a(n) = a(n-1)*a(n-2) + (n-2); a(1) = 1, a(2) = 2.at n=6A091339
- Row sums of triangle A091700.at n=6A091701
- Numbers m that are the hypotenuse of exactly 13 distinct integer-sided right triangles, i.e., m^2 can be written as a sum of two squares in 13 ways.at n=22A097102
- Expansion of (1 +3*x -x^2)/((1-x^2)*(1-2*x-x^2)); a Pellian-related sequence.at n=9A114688
- Number of permutations of length n which avoid the patterns 231, 12354.at n=9A116850
- Dispersion of the sequence ([r*n] + 1: n >= 1), where r = 3 + 8^(1/2): square array D(n,m) (n, m >= 1), read by ascending antidiagonals.at n=40A120859
- Row sums of triangle A126445; a(n) = Sum_{k=0..n} C( C(n+2,3) - C(k+2,3), n-k).at n=4A126449
- Prime numbers concatenated with 45.at n=16A137521