1122
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 6
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 2592
- Proper Divisor Sum (Aliquot Sum)
- 1470
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 320
- Möbius Function
- 1
- Radical
- 1122
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 4
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
- yes
Recreational
- Happy Number
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 44
- 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
- yes
- Odd
- no
Appears in sequences
- Oblong (or promic, pronic, or heteromecic) numbers: a(n) = n*(n+1).at n=33A002378
- Numbers of the form (p^2 - 49)/120 where p is prime.at n=37A002382
- a(n) = 2*n*(2*n-1).at n=17A002939
- Self numbers divisible by sum of their digits (or, self numbers which are also Harshad numbers).at n=29A003219
- Numbers that are the sum of 6 positive 5th powers.at n=28A003351
- Hoggatt sequence with parameter d=4.at n=5A005362
- Number of unrooted triangulations with reflection symmetry of a disk with 2 internal nodes and n+3 nodes on the boundary.at n=10A005509
- a(n) = (n-1)*n*(n+4)/6.at n=18A005581
- Coefficients of Chebyshev polynomials.at n=7A005583
- Solution to Pellian: y such that x^2 - n y^2 = +- 1, +- 4.at n=85A006705
- Numbers in base 3.at n=44A007089
- 5th-order maximal independent sets in cycle graph.at n=39A007388
- Consider Leibniz's harmonic triangle (A003506) and look at the non-boundary terms. Sequence gives numbers appearing in denominators, sorted.at n=45A007622
- Numbers that contain only 1's and 2's. Nonempty binary strings of length n in lexicographic order.at n=17A007931
- Numbers that contain only 1's, 2's and 3's.at n=43A007932
- Coordination sequence T1 for Zeolite Code ATT.at n=24A008041
- Coordination sequence T4 for Zeolite Code HEU.at n=22A008119
- Coordination sequence T1 for Banalsite.at n=20A008249
- Coordination sequence T2 for Banalsite.at n=20A008250
- Multiples of 22.at n=51A008604