1854
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 4056
- Proper Divisor Sum (Aliquot Sum)
- 2202
- 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
- 612
- Möbius Function
- 0
- Radical
- 618
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 117
- 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
- Subfactorial or rencontres numbers, or derangements: number of permutations of n elements with no fixed points.at n=7A000166
- Permanent of a certain cyclic n X n (0,1) matrix.at n=7A000805
- Numbers that are the sum of 3 nonnegative cubes in more than 1 way.at n=19A001239
- Expansion of 1/(1-x)^2/(1-x^2)/(1-x^6)/(1-x^12)/(1-x^24)/(1-x^48)/(1-x^60).at n=39A001365
- Number of transitive permutation groups of degree n.at n=27A002106
- Coordination sequence T2 for Zeolite Code LEV.at n=32A008128
- Triangle T(n,k) of rencontres numbers (number of permutations of n elements with k fixed points).at n=28A008290
- Triangle of rencontres numbers.at n=15A008291
- Triangle read by rows: T(n,k) = number of permutations of [n] allowing i->i+j (mod n), j=0..k-1.at n=26A008305
- Numbers that are the sum of 3 positive cubes in more than one way.at n=11A008917
- Coordination sequence T2 for Zeolite Code AHT.at n=29A009867
- Triangle read by rows: T(n,k) is the number of permutations of [n] having k consecutive ascending pairs (0 <= k <= n-1).at n=26A010027
- Smallest positive number that can be written as sum of distinct Fibonacci numbers in n ways.at n=39A013583
- a(n) = floor( n! / e ).at n=6A014508
- Powers of fifth root of 6 rounded down.at n=21A018129
- Powers of fifth root of 23 rounded down.at n=12A018180
- Powers of fifth root of 23 rounded to nearest integer.at n=12A018181
- a(n) is the concatenation of n and 3n.at n=17A019551
- Numbers k such that the continued fraction for sqrt(k) has period 20.at n=44A020359
- 7th differences of factorial numbers.at n=0A023044