6442
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 9666
- Proper Divisor Sum (Aliquot Sum)
- 3224
- 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
- 3220
- Möbius Function
- 1
- Radical
- 6442
- 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
- 23
- 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
- Numbers k such that the continued fraction for sqrt(k) has period 57.at n=8A020396
- Number of 5-ary rooted trees with n nodes and height at most 5.at n=14A036616
- Numbers n such that there are equal numbers of 0's and 1's in first n digits of binary representation of Pi.at n=17A039624
- Denominators of continued fraction convergents to sqrt(178).at n=7A041329
- Numbers whose base-4 representation contains exactly two 1's and four 2's.at n=34A045099
- Numbers n such that 261*2^n-1 is prime.at n=26A050889
- Consider all integer triples (i,j,k), j,k>0, with binomial(i+2,3)=binomial(j+2,3)+k^3, ordered by increasing i; sequence gives i values.at n=29A054221
- A054221 without cubes.at n=12A054224
- Nearest integer to n^5/25.at n=10A061003
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 93 ).at n=27A063366
- a(n) = (9*n^2 - 3*n + 2)/2.at n=38A080855
- a(n) = (5*n^3+12*n^2+n+6)/6.at n=19A114211
- Numbers k such that both k and the k-th prime have nonincreasing digits.at n=31A116067
- Number of rooted trees with total weight n, where the weight of a node at height k is k (with the root considered to be at level 1).at n=47A117357
- Number of base 12 circular n-digit numbers with adjacent digits differing by 5 or less.at n=4A125375
- a(n) = 3*n^2 - 4*n + 3.at n=46A141631
- Partial sums of A003418.at n=10A173185
- Numbers k such that k and k+3 are in A002822.at n=44A173233
- Numbers n such that 4*7^n + 1 is prime.at n=16A204323
- Triangle T(n,k) of orders of degree-n irreducible polynomials over GF(11) listed in ascending order.at n=55A218336