7718
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
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 12312
- Proper Divisor Sum (Aliquot Sum)
- 4594
- 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
- 3616
- Möbius Function
- -1
- Radical
- 7718
- 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
- 57
- 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
- yes
- Odd
- no
Appears in sequences
- Powers of fifth root of 7 rounded up.at n=23A018134
- Fibonacci sequence beginning 4, 18.at n=14A022384
- 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 86.at n=22A031584
- Numbers whose base-5 representation contains exactly two 2's and three 3's.at n=29A045273
- a(n) = Sum_{k=1..n} phi(k)^2.at n=36A057434
- Numbers k such that k and its reversal are both multiples of 17.at n=28A062906
- Non-palindromic number and its reversal are both multiples of 17.at n=19A062915
- Smallest of 5 consecutive integers divisible respectively by 5 consecutive primes.at n=4A072730
- Integers i such that 16*i XOR 17*i = 33*i.at n=40A115833
- Fibonacci central tridiagonal matrices as a triangular sequence from a recursive polynomial definition.at n=30A123974
- Convolution triangle of A030266, which shifts left under self-COMPOSE.at n=37A125278
- A Moessner triangle using (1, 2, 1, 2, 1, 2, ...).at n=28A125751
- a(n) = 3*a(n-1) - 2*a(n-2) - a(n-3) + a(n-4) with n>3, a(0)=1, a(1)=2, a(2)=3, a(3)=7.at n=16A131300
- a(0)=4; a(n)=n^2+a(n-1) for n>0.at n=28A153058
- Sampling n numbers between 1 and a(n)-1, you are guaranteed to always find two subsets whose sums are equal.at n=14A180459
- Number of 6 X 6 0..n matrices with each 2 X 2 subblock idempotent.at n=27A224668
- a(n) = ceiling(n^3*(Pi/2)).at n=16A248198
- Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 or 00000011.at n=9A259716
- T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000011.at n=45A259723
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 113", based on the 5-celled von Neumann neighborhood.at n=22A270179