8942
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 14256
- Proper Divisor Sum (Aliquot Sum)
- 5314
- 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
- 4192
- Möbius Function
- -1
- Radical
- 8942
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- 47
- 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
- Numbers whose base-4 representation contains exactly four 2's and two 3's.at n=34A045155
- Triangle T(n,k) is the number of restricted growth strings (RGS) of set partitions of {1..n} that have an increase at index k (1<=k<n).at n=35A056861
- Triangle T(n,k) giving number of Dyck paths of length 2n with exactly k hills (0 <= k <= n).at n=68A065600
- Largest eigenvalue, rounded to the nearest integer, of a rank n matrix of 1..n^2 filled successively along antidiagonals (A069480).at n=24A072332
- a(n) = (1/2)*(Bell(n+2)-Bell(n+1)+Bell(n)).at n=7A087649
- Number of Q_2-isomorphism classes of fields of degree n in the algebraic closure of Q_2.at n=21A100983
- Numbers k such that k and 8*k, taken together, are zeroless pandigital.at n=32A115932
- Elements of A005282 that are also the sum of a pair of not necessarily distinct elements of A005282.at n=15A133604
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (0, 0, 1), (0, 1, 0), (1, -1, -1)}.at n=9A149815
- Multiples of 17 whose reversal + 1 is also a multiple of 17.at n=28A166391
- Positions of 3's in A234323.at n=5A234804
- Smallest k such that k^2 is a concatenation of two numbers x and y where y = x + n^2 and x and y have the same number of digits.at n=36A236383
- Numbers k such that (29*10^k - 41)/3 is prime.at n=21A275284
- Twice-partitioned numbers where the first partition is constant.at n=20A279787
- Number of Dyck paths of length 2n with exactly 2 hills.at n=11A294527
- a(n) = a(n-1) + a(n-2) + a([2n/3]), where a(0) = 1, a(1) = 2, a(2) = 3.at n=15A298343
- Numbers k such that neighboring digits of k^22 are distinct.at n=12A318763
- Numbers k such that k^2 and k^3, when reversed, are prime.at n=40A320909
- The number of permutations of {1,2,...,n,1,2,...,n} with the property that there are k or fewer numbers between the two k's in the set for k=1,...,n.at n=5A322180
- Number of edges in a regular drawing of a complete bipartite graph where the vertex positions on each part equal the Farey series of order n.at n=5A359693