8668
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 28
- Digital Root
- 1
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 16632
- Proper Divisor Sum (Aliquot Sum)
- 7964
- 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
- 3920
- Möbius Function
- 0
- Radical
- 4334
- Omega Function (Ω)
- 4
- 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
- 140
- 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
- Cluster series for bond percolation problem on square lattice.at n=9A003198
- Position of n^3 + 9 in A024975.at n=42A024979
- Numbers whose set of base-14 digits is {2,3}.at n=24A032814
- Palindromic Fibonacci-lucky numbers.at n=41A039674
- Base 10 palindromes that start with 8.at n=18A043043
- Palindromic and divisible by 4.at n=43A045639
- Palindromes with exactly 4 prime factors (counted with multiplicity).at n=36A046330
- Composite palindromes whose sum of prime factors is palindromic (counted with multiplicity).at n=15A046354
- Palindromes expressible as the sum of 4 consecutive palindromes.at n=5A046499
- Palindromes n such that n and n^2 have same digit sum.at n=10A058852
- Smallest multiple of n-th prime with all even digits.at n=44A062281
- Palindromic numbers with even digits.at n=47A062287
- Palindromes neither divisible by any of their digits nor by the sum of their digits.at n=47A082948
- a(n) = binomial(n+5,6) + binomial(n+3,3) + binomial(n+2,3) + binomial(n-1,1).at n=11A105450
- Product of a prime number p and the number of primes smaller than p.at n=44A117495
- Lenny Conundrum #168: Neopet species in alphabetical order, converted to digits by the phone keypad code.at n=46A119568
- Numbers k such that (k-1)*2^k + 1 is prime.at n=9A128001
- a(n) is the least palindrome > a(n-1) such that a(1) + a(2) + ... + a(n) is a semiprime.at n=43A131260
- Palindromic Ulam numbers.at n=25A173542
- Numbers n such that d(1)^1 + d(2)^2 + ... + d(p)^p and d(1)^p + d(2)^p-1 +... + d(p)^1 are squares, where d(i), i=1..p, are the digits of n.at n=20A178360