15470
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 32
- Divisor Sum
- 36288
- Proper Divisor Sum (Aliquot Sum)
- 20818
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 4608
- Möbius Function
- -1
- Radical
- 15470
- Omega Function (Ω)
- 5
- Little Omega Function (ω)
- 5
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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 84
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- yes
- Odd
- no
Appears in sequences
- a(n)=1, a(n+1) = lcm(a(n),b(n)) / gcd(a(n),b(n)), where {b(n)} = {fibonacci(n)}.at n=9A008341
- Perimeters of more than one primitive Pythagorean triangle.at n=24A024408
- a(n) = (2*n-1)*(3*n-1)*(4*n-1).at n=9A033589
- One eighth of 9-factorial numbers.at n=3A035022
- (Terms in A029665)/2.at n=48A051425
- (Terms in A029643)/2.at n=46A051469
- a(n) = (11*n + 4)*C(n+3, 3)/4.at n=12A055268
- The start of a record-breaking run of consecutive integers with a number of prime factors (counted with multiplicity) equal to 5.at n=2A067820
- Number of 5-gonal compositions of n into positive parts.at n=29A069983
- a(n) = n*(n+1)*(n^2+1)/2.at n=13A071237
- a(n) = sigma_3(n) - sigma_2(n) - sigma_1(n).at n=23A092350
- A sequence derived from pentagonal numbers, or a Stirling number of the first kind matrix.at n=16A094952
- Triangle read by rows: T(n,k) = binomial(2n+1, n-k)*Fibonacci(2k+1), 0 <= k <= n.at n=32A103245
- a(n) = A019565(n-th prime).at n=28A109163
- Smallest number m such that m, m+1 and m+2 have exactly n prime factors (counted with multiplicity).at n=3A113752
- Triangle read by rows: matrix product of the binomial coefficients with the Stirling numbers of the second kind.at n=33A126350
- a(n) = n*(n+1)*(11*n+1)/6.at n=20A132112
- Triangle read by rows: A008277 * A007318.at n=30A137597
- Ulam's spiral (WSW spoke).at n=31A143854
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (-1, 1, 1), (0, -1, 1), (0, 1, -1), (1, 1, 0)}.at n=8A149489