1864
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 3510
- Proper Divisor Sum (Aliquot Sum)
- 1646
- 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
- 928
- Möbius Function
- 0
- Radical
- 466
- Omega Function (Ω)
- 4
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 86
- 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
- Symmetries in unrooted 3-trees on n+1 vertices.at n=13A003612
- Coordination sequence T2 for feldspar.at n=29A008255
- Coordination sequence T2 for Zeolite Code iRON.at n=30A009882
- a(n) = floor( n*(n-1)*(n-2)/25 ).at n=37A011907
- Numbers k such that phi(k) + 9 | sigma(k + 9).at n=22A015788
- Numbers k such that phi(k) + 10 | sigma(k + 10).at n=41A015789
- A015938(n)-2^n.at n=39A015939
- Fibonacci sequence beginning 0, 8.at n=13A022091
- Numbers k such that Fib(k) == -21 (mod k).at n=21A023168
- Convolution of Lucas numbers and A014306.at n=14A023624
- Numbers that are the sum of 4 distinct nonzero squares in exactly 10 ways.at n=49A025385
- Index of 6^n within the sequence of the numbers of the form 3^i*6^j.at n=47A025713
- Expansion of (theta_3(z)*theta_3(7z) + theta_2(z)*theta_2(7z))^4.at n=7A028596
- Numbers whose base-5 representation has 3 fewer 0's than 4's.at n=32A031476
- Index of first occurrence of n as a term in A001203, the continued fraction for Pi.at n=53A032523
- Expansion of Product_{d | 48} theta_3(q^d).at n=36A033760
- Number of partitions satisfying cn(2,5) + cn(3,5) <= cn(1,5) and cn(2,5) + cn(3,5) <= cn(4,5).at n=32A039877
- Numerators of continued fraction convergents to sqrt(86).at n=7A041152
- Denominators of continued fraction convergents to sqrt(263).at n=10A041493
- Numerators of continued fraction convergents to sqrt(282).at n=6A041530