3645
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 14
- Divisor Sum
- 6558
- Proper Divisor Sum (Aliquot Sum)
- 2913
- 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
- 1944
- Möbius Function
- 0
- Radical
- 15
- Omega Function (Ω)
- 7
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 43
- 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
- yes
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of positive integers <= 2^n of form x^2 + 3 y^2.at n=14A000205
- Numbers that are the sum of 5 positive 6th powers.at n=20A003361
- Hadamard maximal determinant problem: largest determinant of a (real) {0,1}-matrix of order n.at n=12A003432
- Numbers of the form 3^i*5^j with i, j >= 0.at n=26A003593
- a(n) = 5*3^n.at n=6A005030
- Number of 3-voter voting schemes with n linearly ranked choices.at n=16A007009
- Coordination sequence T2 for Zeolite Code APD.at n=40A008035
- Coordination sequence T4 for Zeolite Code -PAR.at n=43A009858
- Tetranacci numbers arising in connection with current algebras sp(2)_n.at n=11A014610
- Numbers k such that k | 14^k + 1.at n=44A015965
- Coordination sequence T2 for Zeolite Code OSI.at n=40A016431
- Place n distinguishable balls in n boxes (in n^n ways); let f(n,k) = number of ways that max in any box is k, for 1 <= k <= n; sequence gives f(n,n-2)/n.at n=7A019579
- a(n) = n*(n - 1)^3/2.at n=10A019582
- Ordered sequence of distinct terms of the form floor(x^i * floor(x^j)), i,j >= 0, where x = sqrt(3).at n=36A022769
- Ternary expansion uses each positive digit just once.at n=48A023741
- Numbers of form 5^i*9^j, with i, j >= 0.at n=14A025624
- Numbers with 14 divisors.at n=16A030632
- Concatenation of n and n + 9 or {n,n+9}.at n=35A032614
- a(n) = 5*n^2.at n=27A033429
- Numbers whose prime factors are 3 and 5.at n=13A033849