1986
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 3984
- Proper Divisor Sum (Aliquot Sum)
- 1998
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- yes
Derived Values
- Euler's Totient
- 660
- Möbius Function
- -1
- Radical
- 1986
- Omega Function (Ω)
- 3
- 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
- 94
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- yes
- 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
- a(n) = a(n-2) + a(n-5).at n=42A001687
- Numbers k such that 21*2^k - 1 is prime.at n=19A002238
- Coordination sequence for NiAs(2), As position.at n=21A009945
- Coordination sequence for NiAs(2), Ni position.at n=21A009946
- a(0) = 1, a(n) = 31*n^2 + 2 for n>0.at n=8A010020
- Numbers k such that k | 8^k + 8.at n=17A015897
- Six iterations of Reverse and Add are needed to reach a palindrome.at n=38A015984
- Numbers k such that the continued fraction for sqrt(k) has period 22.at n=43A020361
- a(n) = position of n^3 + 9 in A003072.at n=25A024971
- Molien series for full 8 X 8 Siegel modular group H_3 of order 371589120.at n=30A027633
- a(n) = n^2 + n + 6.at n=44A027691
- Numbers having period-14 7-digitized sequences.at n=42A031205
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 44.at n=5A031542
- a(n) = sum of the remainders when the n-th prime is divided by primes up to the (n-1)-th prime.at n=52A033955
- Expansion of Molien series for 8-dimensional complex Clifford group of genus 3 and order 743178240.at n=15A039946
- Denominators of continued fraction convergents to sqrt(302).at n=8A041569
- Denominators of continued fraction convergents to sqrt(639).at n=8A042227
- Numbers k such that 6 and 8 occur juxtaposed in the base-10 representation of k but not of k-1.at n=39A043256
- Numbers whose base-7 representation contains exactly three 5's.at n=13A043415
- Numbers k such that 6 and 8 occur juxtaposed in the base-10 representation of k but not of k+1.at n=39A044036