1208
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 2280
- Proper Divisor Sum (Aliquot Sum)
- 1072
- 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
- 600
- Möbius Function
- 0
- Radical
- 302
- Omega Function (Ω)
- 4
- 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
- 18
- 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
- Numbers k such that phi(2k-1) < phi(2k), where phi is Euler's totient function A000010.at n=16A001836
- Numbers not of form p + 2^x + 2^y.at n=23A006286
- Coordination sequence T3 for Zeolite Code MFI.at n=22A008166
- Coordination sequence T7 for Zeolite Code MFI.at n=22A008170
- Coordination sequence T7 for Zeolite Code NES.at n=22A008211
- Coordination sequence for sigma-CrFe, Position Xc.at n=9A009961
- a(n) = n^2 - floor( n/2 ).at n=35A014848
- Numbers k such that phi(k) + 9 | sigma(k + 9).at n=17A015788
- Expansion of 1/(1-x^3-x^4-x^5).at n=30A017818
- Coordination sequence T1 for Zeolite Code CGF.at n=24A019451
- a(n) = a(n-1) + c(n) for n >= 3, a( ) increasing, given a(1)=1 a(2)=2; where c( ) is complement of a( ).at n=43A022946
- a(n) is least k such that k and 5k are anagrams in base n (written in base 10).at n=3A023097
- Numbers k such that Fib(k) == 21 (mod k).at n=12A023179
- Convolution of A023532 and (1, p(1), p(2), ...).at n=30A023598
- Convolution of A000201 and A014306.at n=41A023666
- a(n) = s(1)*t(n) + s(2)*t(n-1) + ... + s(k)*t(n+1-k), where k = floor((n+1)/2), s = (natural numbers >= 3), t = A023532.at n=9A024314
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers >= 3), t = (Lucas numbers).at n=8A024877
- Numbers that are the sum of 4 distinct nonzero squares in exactly 8 ways.at n=50A025383
- Coordination sequence T1 for Zeolite Code SAT.at n=25A027373
- Least k such that 1+2+...+k >= E{1,2,...,n}, where E = 2nd elementary symmetric function.at n=47A027916