1286
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
- 4
- Divisor Sum
- 1932
- Proper Divisor Sum (Aliquot Sum)
- 646
- 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
- 642
- Möbius Function
- 1
- Radical
- 1286
- 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
- 26
- 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
- yes
- Odd
- no
Appears in sequences
- Number of partitions of n, with three kinds of 1,2 and 3 and two kinds of 4,5,6,....at n=9A000715
- Numbers that are the sum of 11 positive 8th powers.at n=5A003389
- Coordination sequence T1 for Zeolite Code FAU.at n=30A008105
- Coordination sequence T2 for Zeolite Code LTN.at n=25A008141
- Coordination sequence T5 for Zeolite Code MTT.at n=22A008193
- Number of ordered triples of integers from [ 1,n ] with no common factors between pairs.at n=28A015632
- Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite AFO = AlPO4-41 [Al20P20O80] starting with a T4 atom.at n=4A018956
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite DAC = Dachiardite Na5[Al5Si19O48].12H2O starting with a T4 atom.at n=10A019105
- Coordination sequence T2 for Zeolite Code SAO.at n=28A019572
- Numbers k such that the continued fraction for sqrt(k) has period 18.at n=36A020357
- Number of solutions to c(1)*prime(1) +...+ c(2n+1)*prime(2n+1) = 0, where c(i) = +-1 for i > 1, c(1) = 1.at n=9A022894
- a(n) = a(n-1) + c(n-1) for n >= 2, a( ) increasing, given a(1)=3, where c( ) is complement of a( ).at n=45A022935
- [ (4th elementary symmetric function of S(n))/(3rd elementary symmetric function of S(n)) ], where S(n) = {first n+3 positive integers congruent to 1 mod 4}.at n=49A024390
- a(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 1.at n=19A025005
- Numbers that are the sum of 3 nonzero squares in 10 or more ways.at n=38A025338
- Numbers that are the sum of 3 distinct nonzero squares in 9 or more ways.at n=44A025355
- Numbers that are the sum of 3 distinct nonzero squares in 10 or more ways.at n=30A025356
- a(n) is the smallest number that is the sum of 3 nonzero squares in exactly n ways.at n=14A025414
- Least sum of 3 distinct nonzero squares in exactly n ways.at n=13A025415
- a(n) = sum of the numbers between the two n's in A026370.at n=18A026373