16230
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 39024
- Proper Divisor Sum (Aliquot Sum)
- 22794
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 4320
- Möbius Function
- 1
- Radical
- 16230
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 4
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
- 115
- 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
- yes
- Odd
- no
Appears in sequences
- Expansion of 1 + x/(1 - 2*x - x^3 + x^4).at n=14A052908
- Numbers k such that k-1, k+1 and k^2+1 are prime numbers.at n=31A070155
- Number of 7/3+-power-free words over the alphabet {0,1}.at n=36A082380
- Average of twin-prime pairs for pairs that are expressible as the sum of two triangular numbers.at n=30A117313
- a(1)=1, a(n) = the multiple of n which is >= (sum{k=1 to n-1} a(k)) and is < (n + sum{k=1 to n-1} a(k)).at n=14A128022
- Numbers m such that m^4-1 has no divisors d with 1 < d < m-1.at n=32A129293
- a(n) = 2^n - n*(n-3).at n=14A176777
- Number of strictly increasing arrangements of 6 nonzero numbers in -(n+4)..(n+4) with sum zero.at n=12A188125
- Sum of the largest missing values in all compositions of n with the LMV property.at n=13A188577
- Numbers m with m-1, m+1 and prime(m)+2 all prime.at n=35A259539
- Magic sums of 4 X 4 semimagic squares composed of consecutive primes.at n=18A270864
- Volatile sequence: a(n) = A018227(n)-6.at n=40A271998
- Number T(n,k) of permutations p of [n] such that in 0p the largest up-jump equals k and no down-jump is larger than 2; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=49A291680
- Number of n X 3 0..1 arrays with each 1 adjacent to 1 or 3 king-move neighboring 1's.at n=7A295938
- T(n,k)=Number of nXk 0..1 arrays with each 1 adjacent to 1 or 3 king-move neighboring 1s.at n=47A295943
- T(n,k)=Number of nXk 0..1 arrays with each 1 adjacent to 1 or 3 king-move neighboring 1s.at n=52A295943
- Numbers k such that the determinant of the Vandermonde matrix of their digits is equal to phi(k), the Euler totient function of k.at n=10A307587
- Number of multiset partitions of uniform integer partitions of n in which all parts have the same length.at n=43A320451
- Number of permutations p of [n] such that in 0p the largest up-jump equals four and no down-jump is larger than 2.at n=5A321111
- Number of n element multisets of the 15th roots of unity with zero sum.at n=46A321418