16540
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 34776
- Proper Divisor Sum (Aliquot Sum)
- 18236
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6608
- Möbius Function
- 0
- Radical
- 8270
- Omega Function (Ω)
- 4
- 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
- 97
- 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
- Number of ordered 5-tuples of integers from [ 1,n ] with no common factors among pairs.at n=34A015663
- Greatest number m such that the fractional part of (3/2)^A153663(n) >= 1-(1/m).at n=16A153667
- Numbers k such that 2^k + 27 is prime.at n=36A157007
- Number of 1-dimensional sandpiles with n grains.at n=22A186085
- Years >= 1801 in which Christmas falls in Sukkot.at n=18A222419
- Number of (n+1) X (2+1) 0..1 arrays colored with the sum of the upper and lower median values of each 2 X 2 subblock.at n=15A236324
- Number of partitions of n for which (number of occurrences of the least part) > (number of occurrences of greatest part).at n=36A236544
- The 240-degree spoke (or ray) of a hexagonal spiral of Ulam.at n=37A244805
- Number of (n+2) X (2+2) 0..1 arrays with every 2 X 2 and 3X3 subblock diagonal maximum minus antidiagonal minimum nondecreasing horizontally and vertically.at n=15A253504
- Sum of numbers in the n-th antidiagonal of the reciprocity array of 3.at n=40A259583
- Numbers n such that Bernoulli number B_{n} has denominator 330.at n=43A272183
- a(n) is the number of permutations of length n that avoid the pattern 321 and the mesh pattern (12, 381) or the same sequence for the mesh pattern (12, 471).at n=9A289612
- Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-2)^2, where a(0) = 1, a(1) = 3, b(0) = 2, and (a(n)) and (b(n)) are increasing complementary sequences.at n=14A296258
- Number of edges in a complete bipartite graph where the vertices in the two parts are placed on opposite sides of a parabola at integer y coordinates y = 1, 2, ...n.at n=13A392444