16627
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 17920
- Proper Divisor Sum (Aliquot Sum)
- 1293
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 15336
- Möbius Function
- 1
- Radical
- 16627
- 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
- 190
- 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 99*2^k+1 is prime.at n=39A032399
- Numbers whose base-4 representation contains exactly four 0's and three 3's.at n=17A045084
- Cyclotomic polynomials Phi_n at x=phi, ceiled up (where phi = tau = (sqrt(5)+1)/2).at n=25A063707
- a(n) is the smallest number k such that A073813(k) = prime(n).at n=32A073814
- Positions of records in A069862.at n=17A088947
- Indices of primes in sequence defined by A(0) = 59, A(n) = 10*A(n-1) - 21 for n > 0.at n=23A101583
- Indices of primes in sequence defined by A(0) = 47, A(n) = 10*A(n-1) + 17 for n > 0.at n=11A101736
- a(n) is such that the a(n)-th composite number is (n-th prime)^2.at n=32A120389
- Number of partitions of n such that the largest part is coprime to every other part.at n=42A130690
- Primitive numbers in A158235.at n=21A158245
- (n+1)^prime(n+1) + n^prime(n).at n=2A160501
- Years >= 1801 in which Christmas falls in Sukkot.at n=25A222419
- Number of partitions of n such that at least half the parts are identical.at n=40A237269
- Absolute discriminants of complex quadratic fields with 3-class rank 2.at n=12A242862
- Absolute discriminants of complex quadratic fields with 3-class group of elementary abelian type (3,3) of rank 2.at n=8A242863
- Absolute discriminants of complex quadratic fields with 3-class group of type (3,3) and Hilbert 3-class field tower of exact length 3, except for the cases mentioned in the COMMENTS.at n=2A242878
- Minimal absolute discriminants a(n) of complex quadratic fields with 3-class group of type (3,3), 3-principalization type E.14 (3122), and second 3-class group G of odd nilpotency class cl(G)=2(n+2)+1.at n=0A247693
- Partial sums of A253086.at n=54A255150
- Number of bifurcating nodes at generation n in the binary tree of persistently squarefree numbers (see A293230).at n=34A293522
- Sum of sums of omegas of parts over all integer partitions of n.at n=26A325536