15487
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 16416
- Proper Divisor Sum (Aliquot Sum)
- 929
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 14560
- Möbius Function
- 1
- Radical
- 15487
- 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
- 58
- 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
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (odd natural numbers), t = A000201 (lower Wythoff sequence).at n=37A025113
- Odd composite numbers which in base 2 contain their largest proper factor as a substring of digits.at n=27A063131
- Composite numbers not divisible by 2, 3, 5 or 7 which in base 2 contain their largest proper factor as a substring.at n=22A063138
- Winning binary "same game" templates of length n as defined below.at n=13A066345
- Trajectory of n under the Reverse and Add! operation carried out in base 4 (presumably) does not reach a palindrome and (presumably) does not join the trajectory of any term m < n.at n=38A075421
- Shallow diagonal of triangular spiral in A051682.at n=29A081275
- Numbers k such that (k-1)*binomial(2k,k) + 1 is prime.at n=50A085793
- a(n) = smallest k such that the base 4 Reverse and Add! trajectory of A075421(n) joins the trajectory of k.at n=38A091676
- Number of partitions of n in which the number of parts is relatively prime to n.at n=39A102628
- Heptanacci-Lucas numbers.at n=14A104621
- Numbers with at least two odd prime factors (not necessarily distinct) such that in binary representation all divisors of n are contained in n.at n=11A105442
- a(n) = 484*n - 1.at n=31A158330
- a(n) = 32*n^2 - 1.at n=21A158563
- Third left hand column of triangle A163940.at n=17A163943
- Number of nonempty subsets of {1, 2, ..., n} having pairwise coprime elements.at n=27A187106
- Number of nonempty subsets of {1, 2, ..., n} with <=10 pairwise coprime elements.at n=27A187271
- Number of inequivalent n X 3 binary matrices, where equivalence means permutations of rows or columns or the symbol set.at n=15A246148
- Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 181", based on the 5-celled von Neumann neighborhood.at n=13A279672
- Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 579", based on the 5-celled von Neumann neighborhood.at n=13A289468
- Bases in which 11 is a unique-period prime.at n=29A306076