15940
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 33516
- Proper Divisor Sum (Aliquot Sum)
- 17576
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6368
- Möbius Function
- 0
- Radical
- 7970
- 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
- Powers of cube root of 14 rounded up.at n=11A018017
- Numbers k such that the continued fraction for sqrt(k) has period 90.at n=38A020429
- Numerators of continued fraction convergents to sqrt(398).at n=5A041756
- Nonprime numbers k such that sum of aliquot divisors of k is a cube.at n=38A048698
- Values of n such that n^Pi starts with the digits n.at n=4A131496
- Indices of primes in A214830.at n=13A244001
- Numbers n such that Bernoulli number B_{n} has denominator 330.at n=42A272183
- Numbers k such that (28*10^k - 31)/3 is prime.at n=20A293280
- Expansion of 1/((1 - x)*(1 - Sum_{k>=1} x^prime(k))).at n=25A303665
- Expansion of Product_{k=1..10} theta_3(q^k), where theta_3() is the Jacobi theta function.at n=39A320242
- Number of edges in a square when n internal squares are drawn between the 4n points that divide each side into n+1 equal parts.at n=45A357061
- Number of finite sets of positive integers whose right half (exclusive) sums to n.at n=43A360954