16837
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 17100
- Proper Divisor Sum (Aliquot Sum)
- 263
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 16576
- Möbius Function
- 1
- Radical
- 16837
- Omega Function (Ω)
- 2
- 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
- 35
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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 the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 8.at n=33A031421
- Super-4 Numbers (4 * n^4 contains substring '4444' in its decimal expansion).at n=12A032744
- Number of chiral n-ominoes in n-2 space.at n=10A036365
- Numbers k such that 13*3^k + 2 is prime.at n=15A084125
- Number of increasing subsequences that can be made from the sequence of successive primes.at n=24A091956
- Numbers n such that n and its reversal are distinct brilliant numbers (A078972).at n=24A097435
- Both n and the reverse of n are brilliant numbers (A078972).at n=38A115655
- a(n) = 8*n^2 - 2*n + 1.at n=46A185438
- Riordan array (1/(1-3*x+x^2), x*(1-x)/(1-3*x+x^2)).at n=48A206800
- Triangle of coefficients of polynomials u(n,x) jointly generated with A210742; see the Formula section.at n=51A210741
- Number of (n+1) X (1+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2 X 2 subblock equal.at n=4A237802
- Number of (n+1)X(5+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2X2 subblock equal.at n=0A237806
- T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2X2 subblock equal.at n=10A237809
- T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2X2 subblock equal.at n=14A237809
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 998", based on the 5-celled von Neumann neighborhood.at n=32A273857
- Number of sets of exactly eight positive integers <= n having a square element sum.at n=14A281868
- MM-numbers of labeled simple hypergraphs with no singletons spanning an initial interval of positive integers.at n=23A320463
- MM-numbers of labeled multi-hypergraphs with no singletons spanning an initial interval of positive integers.at n=29A320464
- a(n) is the multiplicative inverse of A008514(n) modulo A008514(n+1).at n=9A334121
- Numbers k such that k+i^2, i=0..6 are all semiprimes.at n=4A361262