16895
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 29
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 21120
- Proper Divisor Sum (Aliquot Sum)
- 4225
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 12960
- Möbius Function
- -1
- Radical
- 16895
- 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
- 203
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers k such that k * (1+i)^k + 1 is a Gaussian prime.at n=24A058770
- Numbers k such that k * (1+i)^k - i is a Gaussian prime.at n=16A058772
- Numbers n such that n^2*2^n + n*2^((n + 1)/2) + 1 is prime.at n=9A058777
- The sum of the non-divisors of n (less than n) is a multiple of the sum of the divisors of n.at n=17A066860
- Number of 2-input gates used to synthesize parity function in disjunctive normal form (DNF) with n inputs.at n=10A074494
- Numbers k such that sum of the divisors d of k divides 1 + 2 + ... + k = k(k+1)/2.at n=19A076617
- a(n) = prime(n)*prime(n+1) + prime(n) + prime(n+1).at n=30A126199
- Number of non-isomorphic maximal independent sets of the n-cycle graph.at n=50A127685
- A sequence of asymptotic density zeta(10) - 1, where zeta is the Riemann zeta function.at n=16A143036
- a(n) = 512n - 1.at n=32A158011
- a(n) = 25*n^2 - 5.at n=25A158446
- a(n) = 66*n^2 - 1.at n=15A158693
- Numbers m with property that m-th triangular number is a sum of divisors of some k-th triangular number (A175849).at n=12A175850
- Number of nX2 0..4 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.at n=23A200984
- Number of zero-sum -n..n arrays of 4 elements with first and second differences also in -n..n.at n=24A201875
- Number of partitions p of n such that (number of numbers of the form 3k in p) is a part of p.at n=38A241546
- Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 105", based on the 5-celled von Neumann neighborhood.at n=15A285828
- Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 205", based on the 5-celled von Neumann neighborhood.at n=17A286697
- Bases b for which there exists an integer y such that y^3 in base b looks like [c,d,e,c,d,e] for base-b digits c,d,e.at n=18A290185
- a(n) = n*((4*n + 1)*(7*n - 4) + 15*n*(-1)^n)/48.at n=30A302766