8118
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 24
- Divisor Sum
- 19656
- Proper Divisor Sum (Aliquot Sum)
- 11538
- 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
- 2400
- Möbius Function
- 0
- Radical
- 2706
- Omega Function (Ω)
- 5
- 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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 65
- 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
- Strobogrammatic numbers: the same upside down.at n=30A000787
- Number of partitions of n into relatively prime parts. Also aperiodic partitions.at n=32A000837
- Numbers with mirror symmetry about middle.at n=15A006072
- Let j = | i - i_written_backwards |, k = j + j_written_backwards; then k is in this sequence.at n=37A008920
- Least term in period of continued fraction for sqrt(n) is 10.at n=18A031434
- Number of partitions of n with equal nonzero number of parts congruent to each of 1 and 2 (mod 4).at n=46A035549
- Base 10 palindromes that start with 8.at n=13A043043
- a(n) = A033001(n)/4.at n=44A043307
- Palindromes that are divisible by 6.at n=26A045641
- Palindromic and divisible by 9.at n=20A045644
- Palindromic even lucky numbers.at n=22A045960
- Palindromes with exactly 5 prime factors (counted with multiplicity).at n=18A046331
- Palindromes expressible as sum of 2 consecutive palindromes.at n=53A046497
- Vertically symmetric numbers.at n=35A053701
- Number of 4-block ordered bicoverings of an unlabeled n-set.at n=13A060091
- Numbers beginning and ending with their multiplicative digital root.at n=42A064704
- Sum of the squares of the a(n)-th and the (a(n)+1)st triangular numbers (A000217) is a perfect square.at n=4A065113
- Harshad numbers which terminate in their digital sum.at n=47A070938
- Concatenation of R(n) (A004086) and n, omitting leading 0's.at n=17A071273
- Palindromic even numbers with an odd number of prime factors (counted with multiplicity).at n=40A075817