16839
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 27
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 24336
- Proper Divisor Sum (Aliquot Sum)
- 7497
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11220
- Möbius Function
- 0
- Radical
- 5613
- Omega Function (Ω)
- 3
- 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
- 66
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers that are the sum of 2 positive 5th powers.at n=22A003347
- Numbers that are the sum of at most 2 positive 5th powers.at n=30A004842
- Numbers k such that k*18^k + 1 is prime.at n=7A007648
- a(n) = ((3*n+1)*2^n - (-1)^n)/9.at n=12A045883
- Sum of 5th powers of digits of n.at n=27A055014
- a(n) = 2^n + 7^n.at n=5A074602
- a(1) = 3; a(n) = smallest number such that the forward as well as the reverse n-th partial concatenation is a prime for n>1. (Reverse concatenation is taken term-wise and not digit-wise).at n=42A083993
- Numbers of form x^5 + y^5, x,y > 0 and x <> y.at n=16A088703
- Number of permutations of length n which avoid the patterns 132, 3421, 4231.at n=14A116725
- Number of tilings of a 4 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares).at n=5A127870
- Numbers that are sums of fifth powers of two distinct primes.at n=3A130292
- Table T(k,n) read along antidiagonals: sum of the k-th powers of the distinct prime factors of A024619(n).at n=31A138296
- Numerators of the convergents of the continued fraction for sqrt(sqrt(2) - 1), the radius vector of the point of bisection of the arc of the unit lemniscate (x^2 + y^2)^2 = x^2 - y^2 in the first quadrant.at n=14A154749
- A000145(n) / 8 - (n^5 + 1).at n=13A188671
- Numbers with 3 or more prime factors (with multiplicity) such that every concatenation of their prime factors is prime.at n=17A217264
- Number A(n,k) of tilings of a k X n rectangle using right trominoes and 1 X 1 tiles; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=49A220054
- Number A(n,k) of tilings of a k X n rectangle using right trominoes and 1 X 1 tiles; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=50A220054
- Number of tilings of a 5 X n rectangle using right trominoes and 1 X 1 tiles.at n=4A220055
- Numbers that are sums of two coprime positive fifth powers.at n=13A228542
- Numbers k such that there is no prime p and index j > k such that A002182(j) = p * A002182(k).at n=6A309042