1556
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
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 2730
- Proper Divisor Sum (Aliquot Sum)
- 1174
- 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
- 776
- Möbius Function
- 0
- Radical
- 778
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 122
- 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
- a(n) = 1000*log_10(n) rounded to the nearest integer.at n=35A004226
- Coordination sequence T3 for Zeolite Code MTW.at n=26A008198
- A B_2 sequence: a(n) = least value such that sequence increases and pairwise sums of distinct elements are all distinct.at n=33A011185
- Number of lines through exactly 5 points of an n X n grid of points.at n=27A018812
- Number of lines through exactly 8 points of an n X n grid of points.at n=42A018815
- Generalized Catalan Numbers x^3*A(x)^2 -(1-x+x^3+x^4)*A(x) + 1 =0.at n=16A023433
- Sum of squares of the first n primes.at n=8A024450
- s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (Lucas numbers), t = A001950 (upper Wythoff sequence).at n=12A024475
- Sum of remainders of n mod prime(k), for k = 1,2,3,...,n.at n=45A024925
- Coordination sequence T2 for Zeolite Code MWW.at n=26A024987
- Index of 6^n within the sequence of the numbers of the form 2^i*6^j.at n=34A025712
- (d(n)-r(n))/5, where d = A026066 and r is the periodic sequence with fundamental period (0,3,1,0,1).at n=24A026068
- Sum of squares of numbers in row n of array T given by A026725.at n=6A027213
- Coordination sequence T3 for Zeolite Code CGS.at n=29A027367
- Coordination sequence T4 for Zeolite Code ITE.at n=27A027372
- Number of distinct products i*j with 0 <= i, j <= n-th prime.at n=19A027419
- 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 18.at n=35A031516
- Numbers whose set of base-6 digits is {1,2}.at n=31A032927
- Numbers whose base-5 expansion has no run of digits with length < 2.at n=40A033018
- Positions of the incrementally largest terms in the continued fraction expansion of zeta(3), offset 1 variant.at n=6A033167