1808
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 10
- Divisor Sum
- 3534
- Proper Divisor Sum (Aliquot Sum)
- 1726
- 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
- 896
- Möbius Function
- 0
- Radical
- 226
- Omega Function (Ω)
- 5
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 16
- 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
- Number of partitions of n into Fibonacci parts (with a single type of 1).at n=42A003107
- Numbers which are the sum of 3 nonzero 4th powers.at n=43A003337
- Number of (undirected) Hamiltonian paths in the n-ladder graph K_2 X P_n.at n=42A003682
- a(n) = floor(e^((n-1)/2)).at n=16A005182
- Maximal length of rook tour on an n X n board.at n=13A006071
- Numbers not of form p + 2^x + 2^y.at n=41A006286
- Coordination sequence T5 for Zeolite Code HEU.at n=28A008120
- Coordination sequence T3 for Zeolite Code LOV.at n=28A008136
- Year of birth of n-th President of U.S.A.at n=16A008745
- Coordination sequence T1 for Zeolite Code RTE.at n=29A009890
- Coordination sequence T2 for Zeolite Code RTE.at n=29A009891
- Coordination sequence T3 for Zeolite Code RTE.at n=29A009892
- Coordination sequence for CaF2(2), Ca position.at n=19A009926
- a(n) = n^2 + n + 2.at n=42A014206
- Expansion of 1/(1 - x^5 - x^6).at n=72A017837
- a(n) = least m such that if r and s in {h/(1 + h^2): h = 1,2,...,n} satisfy r < s, then r < k/m < s for some integer k.at n=47A024828
- a(1) = 3; a(n+1) = a(n)-th nonprime, where nonprimes begin at 1.at n=22A025004
- Numbers that are the sum of 4 nonzero squares in exactly 9 ways.at n=49A025365
- Index of 6^n within the sequence of the numbers of the form 4^i*6^j.at n=52A025714
- Index of 8^n within the sequence of the numbers of the form 5^i*8^j.at n=52A025729