5438
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
- 8160
- Proper Divisor Sum (Aliquot Sum)
- 2722
- 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
- 2718
- Möbius Function
- 1
- Radical
- 5438
- 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
- 67
- 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
- yes
- Odd
- no
Appears in sequences
- Number of n-node animals on f.c.c. lattice.at n=6A007198
- Number of 5-tuples of different integers from [ 1,n ] with no common factors among triples.at n=18A015646
- 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 72.at n=19A031570
- Numbers whose base-5 representation contains exactly two 2's and three 3's.at n=17A045273
- Rounded base-3 logarithm of A082126(n).at n=23A082127
- Consider the family of multigraphs enriched by the species of simple graphs. Sequence gives number of those multigraphs with n labeled edges.at n=5A099700
- Smaller of two consecutive semiprimes with the same digital root.at n=33A118699
- Smallest m such that A122388(m) = n.at n=38A122389
- Numbers such that the digital sum base 2 and the digital sum base 3 and the digital sum base 6 all are equal.at n=44A135123
- Numbers k such that the three numbers k-1, k+3 and k+5 are all prime.at n=42A144840
- 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, -1, 0), (1, 0, 1), (1, 1, 0)}.at n=7A150341
- Binomial transform of A109747.at n=11A153732
- Number of binary strings of length n with equal numbers of 010 and 101 substrings.at n=14A164146
- Fourth row of A166091. Positions of 7's in A166086.at n=27A166056
- Partial sums of A023201.at n=37A172295
- a(n) = 4*n^2 - n - 1.at n=37A185950
- Numbers k such that sum_{i=1..k} d(i)^2 is a square c^2, where d(i) is the number of divisors of i.at n=9A186429
- Construct sequences P,Q,R by the rules: Q = first differences of P, R = second differences of P, P starts with 1,3,9, Q starts with 2,6, R starts with 4; at each stage the smallest number not yet present in P,Q,R is appended to R. Sequence gives P.at n=27A225385
- Numbers n such that n!!! - 3^4 is prime.at n=37A247464
- Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime.at n=5A251839