15876
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 27
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 45
- Divisor Sum
- 48279
- Proper Divisor Sum (Aliquot Sum)
- 32403
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 4536
- Möbius Function
- 0
- Radical
- 42
- Omega Function (Ω)
- 8
- 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
- yes
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 146
- 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
- yes
- Achilles Number
- no
- Perfect Power
- yes
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Appears in sequences
- a(n) = (prime(n) - 1)^2.at n=30A005722
- Square the entries of Pascal's triangle.at n=49A008459
- Square the entries of Pascal's triangle.at n=50A008459
- Squares of elements in Pascal triangle (by row) that are not 1.at n=31A014719
- Squares of elements in Pascal triangle (by row) that are not 1.at n=32A014719
- Squares of elements to right of central element in Pascal triangle (by row) that are not 1.at n=12A014720
- Squares of elements to left of the central element in Pascal triangle (by row).at n=20A014721
- Squares of even elements in Pascal's triangle A007318.at n=18A014727
- Squares of even elements in Pascal's triangle A007318.at n=19A014727
- Squares of numbers in array formed from even elements to the right of middle of rows of Pascal triangle.at n=6A014762
- Squares of distinct elements in Pascal triangle.at n=19A014764
- Squares of even pentagonal pyramidal numbers.at n=4A014800
- a(n) = (3*n)^2.at n=42A016766
- a(n) = (4n + 2)^2.at n=31A016826
- a(n) = (5*n + 1)^2.at n=25A016862
- a(n) = (6*n)^2.at n=21A016910
- a(n) = (7*n)^2.at n=18A016982
- a(n) = (8*n+6)^2.at n=15A017138
- a(n) = (9*n)^2.at n=14A017162
- a(n) = (10*n + 6)^2.at n=12A017342