16386
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 32784
- Proper Divisor Sum (Aliquot Sum)
- 16398
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- yes
Derived Values
- Euler's Totient
- 5460
- Möbius Function
- -1
- Radical
- 16386
- 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
- 53
- 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
- Numbers that are the sum of 3 positive 7th powers.at n=10A003370
- Numbers that are the sum of 10 positive 11th powers.at n=8A004821
- Numbers that are the sum of at most 3 positive 7th powers.at n=22A004865
- Numbers that are the sum of at most 4 positive 7th powers.at n=37A004866
- Coordination sequence for C_3 lattice: a(n) = 16*n^2 + 2 (n>0), a(0)=1.at n=32A010006
- Binary encoding of semiprimes (A001358).at n=45A048623
- Binary encoding of A006881, numbers with two distinct prime divisors.at n=40A048639
- a(n) = 2^n + 2.at n=14A052548
- Numbers n such that n | sigma_13(n).at n=28A055717
- Number of elements in the continued fraction for Sum_{k=0..n} 1/2^2^k.at n=15A056469
- Numbers k such that 2^k - 5 is prime.at n=32A059608
- For a partition P of a positive integer, let f(P) be the product of k+1, over all parts k in P. Let a(n,r) be the sum of f(P) over all partitions P of n with smallest part r. Sequence gives table of a(n,r) for 1 <= r <= n, in the order a(1,1); a(2,1), a(2,2); a(3,1), a(3,2), a(3,3); ...at n=55A079308
- Number of pairs (p,q) of (not necessarily consecutive) primes with q-p = 6 and q < 10^n.at n=5A080841
- Total number of distinct cycles in a particular cellular automata of size n.at n=26A083843
- a(n) = A089709(n+1)/A089709(n).at n=14A089985
- Number of ways of 3-coloring an annulus consisting of n zones joined like a pearl necklace.at n=13A092297
- If p(x) is the x-th prime, then the n-th set of 4 consecutive sexy prime pairs starts at p(a(n)).at n=23A095963
- Numbers n such that n/6 and prime(n)+/-n are all primes.at n=26A105550
- a(0)=a(1)=0, a(2)=2; for n >= 3, a(n) = a(n-1) + 4*a(n-3).at n=16A122946
- a(0) = 2, a(n) = 2^n + 2 for n>=1.at n=14A133140