2866
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4302
- Proper Divisor Sum (Aliquot Sum)
- 1436
- 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
- 1432
- Möbius Function
- 1
- Radical
- 2866
- 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
- 27
- 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 strict 7th-order maximal independent sets in path graph.at n=52A007386
- Number of n step self-avoiding walks on 3 X infinity grid starting from (0,1).at n=10A007825
- Coordination sequence T1 for Zeolite Code EAB.at n=39A008082
- Coordination sequence T4 for Zeolite Code VNI.at n=33A009910
- Composite numbers that are equal to the sum of the first k composites for some k.at n=49A013921
- Number of (unordered) triples of integers from [1,n] with no common factors between pairs.at n=38A015617
- Coordination sequence T2 for Zeolite Code TER.at n=36A016434
- Numbers k such that the continued fraction for sqrt(k) has period 34.at n=29A020373
- The 5x + 1 sequence beginning at 7.at n=18A028389
- 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 52.at n=11A031550
- Expansion of (1+2*x-3*x^2-4*x^3+x^4)/(1-8*x^2+11*x^4).at n=9A033482
- Number of different values of i^2 + j^2 + k^2 for i,j,k in [ 0,n ] (or [ -n,n ]).at n=39A034966
- Numbers n such that BCR(n) = n, where BCR = binary-complement-and-reverse = take one's complement then reverse bit order.at n=43A035928
- Increasing gaps among twin primes: size.at n=25A036063
- Numbers n such that string 6,6 occurs in the base 10 representation of n but not of n-1.at n=28A044398
- Numbers n such that string 6,6 occurs in the base 10 representation of n but not of n+1.at n=28A044779
- Number of asymmetric (identity) trees with n nodes and 8 leaves.at n=4A055339
- Numbers k such that the product of the first k composite numbers minus 1 is a prime.at n=21A057017
- Integers whose set of prime factors (taken with multiplicity) uses each digit exactly once (i.e., is pandigital) in some base b > 1. Numbers are expressed in base 10.at n=25A058760
- Symmetric totally balanced binary sequences: those terms of A014486 which are equal to their reversed complement.at n=25A061855