15684
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 36624
- Proper Divisor Sum (Aliquot Sum)
- 20940
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5224
- Möbius Function
- 0
- Radical
- 7842
- 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
- 53
- 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 directed column-convex polyominoes with perimeter 2n+2.at n=9A006027
- Increasing length runs of consecutive composite numbers (starting points).at n=10A008950
- Coordination sequence for MgNi2, Position Ni1.at n=31A009933
- Smallest start for a run of at least n composite numbers.at n=35A030296
- Smallest start for a run of at least n composite numbers.at n=36A030296
- Smallest start for a run of at least n composite numbers.at n=37A030296
- Smallest start for a run of at least n composite numbers.at n=38A030296
- Smallest start for a run of at least n composite numbers.at n=39A030296
- Smallest start for a run of at least n composite numbers.at n=40A030296
- Smallest start for a run of at least n composite numbers.at n=41A030296
- Smallest start for a run of at least n composite numbers.at n=42A030296
- Smallest of first string of exactly 2n-1 consecutive composite integers.at n=21A045881
- First subsequent, disjoint occurrence of n consecutive nonprimes.at n=35A060064
- Least number k having n distinct representations as the sum of a nonzero Fibonacci number and a prime.at n=7A168382
- Least number k having n unordered partitions into a nonzero Fibonacci number and a prime.at n=7A169790
- Least number k having n distinct representations as the sum of a nonzero Fibonacci number and a prime.at n=8A169791
- First string of 43 consecutive composite numbers.at n=0A177949
- Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant >= 2n.at n=14A210367
- a(n) is the smallest number k > 0 such that k, k + 1, ... , k + n - 1 are nonprime numbers, but k + n is prime.at n=43A230358
- G.f. A(x) satisfies: the sum of the coefficients of x^k, k=0..n, in A(x)^n equals 2^(n^2) for n>=0.at n=4A232689