15267
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 23296
- Proper Divisor Sum (Aliquot Sum)
- 8029
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8712
- Möbius Function
- -1
- Radical
- 15267
- Omega Function (Ω)
- 3
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 32
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 82.at n=33A031580
- Odd numbers with only palindromic prime factors whose sum is palindromic (counted with multiplicity).at n=38A046356
- Numbers n such that p = n^2 + 2, p+2 and p+6 are consecutive primes.at n=25A086380
- In binary representation: least number, k, which occurs n times in its factorial.at n=22A093826
- Triangle read by rows: T(n,k) is the number of k-matchings in the C_n X P_3 graph (C_n is the cycle graph on n vertices and P_3 is the path graph on 3 vertices).at n=43A102089
- The number of times a point sum n is attained in all 7^6 permutations of throwing 7 dice.at n=13A166322
- The number of times a point sum n is attained in all 7^6 permutations of throwing 7 dice.at n=22A166322
- a(n) = 13*n^2 + 7*n + 1.at n=33A168240
- Number of partitions of (4, n) into a sum of distinct pairs.at n=23A268347
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 361", based on the 5-celled von Neumann neighborhood.at n=28A271416
- Hexagonal spiral constructed on the nodes of the triangular net in which each new term is the sum of its neighbors.at n=59A278181
- Sum of 4th powers of proper divisors of n.at n=54A279363
- Numbers k such that 7*10^k + 61 is prime.at n=20A281989
- Numbers k such that {k + 2, k + 4} and {k^2 + 2, k^2 + 4} are both twin prime pairs.at n=9A284014
- Sum of the 4th powers of the odd proper divisors of n.at n=54A352032
- Number of strong dichotomy patterns in Z/2nZ, i.e., bicolor patterns of Z/2nZ with respect to the action of Aff(Z/2nZ) with trivial isotropy group.at n=18A360624
- Number of partitions of [n] such that the number of blocks of size k is a multiple or a divisor of k for every k.at n=9A374329