14909
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 15804
- Proper Divisor Sum (Aliquot Sum)
- 895
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 14016
- Möbius Function
- 1
- Radical
- 14909
- 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
- 71
- 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
- Base-7 palindromes that start with 6.at n=26A043020
- Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= sqrt(n).at n=39A048095
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 15.at n=18A051980
- Reverse of smallest prime factor of k = largest prime factor of k+1; a(1)=1.at n=16A071392
- Numbers whose square starts with 4 identical digits.at n=16A132391
- Half-sum (or average) of cubes of two distinct odd primes.at n=34A138855
- Numerator of Bernoulli(n, -5/6).at n=4A158300
- Hypotenuses c of primitive Pythagorean Triples (a,b,c) such that 2*a+1, 2*b+1 and 2*c+1 are primes.at n=33A165238
- a(n) = n^2 + a(n-1), with a(1)=0.at n=34A168559
- Number of 1X4 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 1 zero-sum 4-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=40A192691
- Numbers that are equal to the sum of the number of divisors of their k first powers, for some k.at n=16A270389
- Number of length-n ternary strings that do not contain both "00" and "11".at n=9A282087
- Numbers whose square starts with exactly 4 identical digits.at n=15A346940
- Numbers k such that k and k + 1 are both lazy-Lucas-Niven numbers (A351719).at n=31A351720
- Integers k for which A000594(k)^2 > 4 k^11, where A000594 is Ramanujan's tau function.at n=35A364087
- Number of polycubes of size n and symmetry class CE.at n=17A376979