7399
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 28
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 8664
- Proper Divisor Sum (Aliquot Sum)
- 1265
- 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
- 6300
- Möbius Function
- 0
- Radical
- 1057
- Omega Function (Ω)
- 3
- 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
- 93
- 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
- no
- Odd
- yes
Appears in sequences
- Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite AEL = AlPO4-11 [Al20P20O80] starting with a T1 atom.at n=5A018945
- a(n) = s(n+3)/3, where s is A024947.at n=13A024948
- 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 85.at n=14A031583
- Numbers whose set of base-9 digits is {1,3}.at n=32A032916
- Numbers having four 1's in base 9.at n=13A043460
- Number of rooted labeled trees of height at most 2.at n=7A052512
- Positions where number of periodic partitions increases.at n=34A059994
- Expansion of Molien series for a certain 4-D group of order 48.at n=50A078411
- The values of some algorithm.at n=8A098213
- a(n) = n^2*(n^3 - n^2 + n + 1)/2.at n=7A101376
- Triangle T, read by rows, equal to Pascal's triangle to the matrix power of Pascal's triangle, so that T = C^C, where C(n,k) = binomial(n,k) and T(n,k) = A000248(n-k)*C(n,k).at n=29A116071
- a(2*n+1) = 9*a(n), a(2*n+2) = 10*a(n) + a(n-1).at n=16A116555
- Sequence relating to the benzene ring.at n=10A120262
- a(n) = n_{n^2}.at n=42A122625
- a(1) = 1; for n>1, a(n) = the smallest number p > a(n-1) such that (a(n-1)+p)/2 is a cube.at n=18A126950
- One-seventh of the difference of squares of legs of primitive Pythagorean triangles, neither of which is a multiple of 7.at n=31A127924
- a(n) = A142590(n)/3.at n=49A142883
- a(n) = 200*n - 1.at n=36A157955
- a(n) = 74*n^2 - 1.at n=9A158744
- A positive integer n is included if all runs of 0's in binary n are of the same length, and if all runs of 1's in binary n are of the same length, and if there are at least two runs of 0's and at least two runs of 1's.at n=43A164714