7308
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
- 1
Divisibility
- Divisor Count
- 36
- Divisor Sum
- 21840
- Proper Divisor Sum (Aliquot Sum)
- 14532
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 2016
- Möbius Function
- 0
- Radical
- 1218
- Omega Function (Ω)
- 6
- Little Omega Function (ω)
- 4
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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 132
- 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
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Appears in sequences
- Associated Stirling numbers.at n=4A000276
- Second-order reciprocal Stirling number (Fekete) a(n) = [[2n+4, n]]. The number of n-orbit permutations of a (2n+4)-set with at least 2 elements in each orbit. Also known as associated Stirling numbers of the first kind (e.g., Comtet).at n=2A001785
- a(n) = 2*binomial(n,3).at n=29A007290
- Triangle T(n,k) read by rows: associated Stirling numbers of first kind (n >= 2, 1 <= k <= floor(n/2)).at n=13A008306
- Base 5 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,3.at n=5A037633
- Number of primes < n^3.at n=41A038098
- Numbers k such that k-th and (k+1)-st term of A038593 differ by 6.at n=35A038637
- Total number of nodes in all simple graphs of n nodes.at n=6A055542
- Areas of a sequence of right-angled figures described below.at n=15A058195
- Engel expansion of 1/e = 0.367879... .at n=42A059193
- Numbers k such that sigma(x) = k has exactly 6 solutions.at n=35A060662
- Triangle of Gandhi polynomial coefficients.at n=13A065748
- Second column of A065748.at n=2A065754
- Engel expansion of sinh(1/3).at n=14A068380
- a(n) = (prime(n)+1)*(prime(n+1)+1)/4.at n=38A079079
- Triangle T(n,k) read by rows; related to number of preorders.at n=26A079510
- Square array of coefficients of binomial polynomials, read by antidiagonals.at n=59A080959
- Maximal number of segments (equivalently, corners) in a rook circuit of a 2n X 2n board.at n=43A085622
- Number of divisor chains of length n in which the first term is a divisor of n(n+1)/2 ("cyclic" divisor chains).at n=28A094098
- Triangle T(n,k) read by rows: associated Stirling numbers of first kind (n >= 0 and 0 <= k <= floor(n/2)).at n=22A106828