15719
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
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 17160
- Proper Divisor Sum (Aliquot Sum)
- 1441
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 14280
- Möbius Function
- 1
- Radical
- 15719
- 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
- 128
- 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
- McKay-Thompson series of class 33B for Monster.at n=40A058637
- Expansion of 1/(1 - x^3 - x^5 - x^7 + x^10), inverse of a Salem polynomial.at n=53A143472
- First string of 43 consecutive composite numbers.at n=35A177949
- Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock summing to a prime and those sums nondecreasing in every row and column.at n=2A251462
- T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock summing to a prime and those sums nondecreasing in every row and column.at n=12A251467
- Where record values occur in A276781, when starting from A276781(2)=1.at n=36A276782
- a(n) is the smallest integer k > n such that (k+1)(k+2)...(2k-2n+1)/(k(k-1)...(k-n+1)) is an integer.at n=35A290791
- Number of compositions (ordered partitions) of n into Pell numbers (A000129).at n=19A355805
- Number of integer partitions of n with integer median of 0-appended first differences.at n=35A360688
- Numerators of the partial sums of the reciprocals of the number of abelian groups function (A000688).at n=46A379359