1199
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1320
- Proper Divisor Sum (Aliquot Sum)
- 121
- 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
- 1080
- Möbius Function
- 1
- Radical
- 1199
- 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
- 70
- 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
- Divisible only by primes congruent to 4 mod 7.at n=36A004622
- a(n) = ceiling((1 + sum of preceding terms) / 2) starting with a(0) = 1.at n=18A005428
- a(n) = n*(5*n - 1)/2.at n=22A005476
- Expansion of x*(1+x-x^2)/((1-x)^4*(1+x)).at n=22A005744
- Odd numbers not of form p + 2^k (de Polignac numbers).at n=20A006285
- Coordination sequence T3 for Zeolite Code CAS.at n=21A008065
- Coordination sequence T1 for Zeolite Code LTN.at n=24A008140
- Coordination sequence T2 for Zeolite Code MTT.at n=21A008190
- a(n) is the concatenation of n and 9n.at n=10A009474
- Coordination sequence T1 for Zeolite Code -ROG.at n=26A009859
- Coordination sequence T1 for Zeolite Code RTH.at n=24A009893
- Expansion of x/(1 - 5*x - 7*x^2).at n=5A015541
- Numbers k such that phi(k + 11) | sigma(k).at n=34A015831
- Coordination sequence T3 for Zeolite Code CGF.at n=24A019453
- Numbers k such that the continued fraction for sqrt(k) has period 18.at n=31A020357
- Fibonacci sequence beginning 4, 11.at n=11A022131
- Numbers k such that Fibonacci(k) == 89 (mod k).at n=21A023182
- Convolution of odd numbers and A014306.at n=37A023661
- Numbers with exactly 3 4's in base 5 expansion.at n=22A023740
- a(n) = 2*(n+1) + 3*n + ... + (k+1)*(n+2-k), where k = floor((n+1)/2).at n=20A024305