1268
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 2226
- Proper Divisor Sum (Aliquot Sum)
- 958
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 632
- Möbius Function
- 0
- Radical
- 634
- Omega Function (Ω)
- 3
- 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
- 39
- 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
- a(n) = n! * (n + 1 + 2*Sum_{k=1...n} 1/k).at n=5A000775
- Number of stochastic matrices of integers.at n=7A000987
- Red rooted red-black trees with n internal nodes.at n=12A001138
- Numbers k such that phi(2k-1) < phi(2k), where phi is Euler's totient function A000010.at n=18A001836
- A generalized partition function.at n=11A002601
- Numbers that are the sum of 3 positive 5th powers.at n=13A003348
- G.f.: (1 + x^3 + x^4 + ... + x^12 + x^15)/Product_{i=1..10} (1 - x^i).at n=19A003403
- Numbers that are the sum of at most 3 positive 5th powers.at n=27A004843
- Numbers that are the sum of at most 4 positive 5th powers.at n=46A004844
- a(n) = floor(n*phi^8), where phi is the golden ratio, A001622.at n=27A004923
- a(n) = round(n*phi^8), where phi is the golden ratio, A001622.at n=27A004943
- Positive even numbers that are not the sum of a pair of twin primes.at n=25A007534
- Coordination sequence T3 for Zeolite Code STI.at n=24A008236
- Coordination sequence T1 for Milarite.at n=22A008256
- Coordination sequence T2 for Milarite.at n=22A008257
- Coordination sequence for quartz.at n=20A008261
- Coordination sequence for MgCu2, Mg position.at n=9A009931
- Number of lines through exactly 9 points of an n X n grid of points.at n=51A018816
- Numbers k such that the continued fraction for sqrt(k) has period 26.at n=27A020365
- Numbers n such that the sum of the digits of Lucas(n) in base 12 is n.at n=15A020998