1772
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
- 3108
- Proper Divisor Sum (Aliquot Sum)
- 1336
- 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
- 884
- Möbius Function
- 0
- Radical
- 886
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 55
- 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 2*3^k - 1 is prime.at n=19A003307
- a(n)=least number m such that m-a(n-1)<>a(j)-a(k) for all j,k less than m; a(1)=1, a(2)=3.at n=40A004979
- Coordination sequence T3 for Zeolite Code AET.at n=29A008009
- Coordination sequence T2 for Zeolite Code AWW.at n=30A008046
- Coordination sequence T1 for Zeolite Code BIK.at n=26A008047
- Coordination sequence T8 for Zeolite Code EUO.at n=26A008103
- Coordination sequence T2 for Zeolite Code NAT.at n=28A008204
- If a, b in sequence, so is ab+4.at n=33A009303
- Phi(n) + 5 | sigma(n + 5).at n=23A015784
- Number of lines through exactly 7 points of an n X n grid of points.at n=42A018814
- Numbers k such that Fibonacci(k) == -3 (mod k).at n=25A023164
- a(n) = sum of the numbers between the two n's in A026366.at n=21A026369
- a(n) = Sum_{j=0..n} Sum_{k=0..j} A026615(j, k).at n=9A026624
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 20.at n=34A031518
- Numbers whose set of base-6 digits is {1,2}.at n=39A032927
- a(n) = 2*n^2 + 3*n + 3.at n=29A033816
- Decimal part of cube root of a(n) starts with 1: first term of runs.at n=10A034127
- Limit of the position of the n-th partition into parts 5k+2 or 5k+3 in the list of all integer partitions sorted in reverse lexicographic order, for integers == 1 (mod 5).at n=44A035406
- Limit of the position of the n-th partition into parts 5k+2 or 5k+3 in the list of all integer partitions sorted in reverse lexicographic order, for integers == 2 (mod 5).at n=34A035407
- Upper of pair of consecutive happy numbers.at n=35A035503