2278
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 3672
- Proper Divisor Sum (Aliquot Sum)
- 1394
- 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
- 1056
- Möbius Function
- -1
- Radical
- 2278
- 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
- yes
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- yes
- 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
- 58
- 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
- Hexagonal numbers: a(n) = n*(2*n-1).at n=34A000384
- Expansion of 1/((1-x)^2*(1-x^2)*(1-x^5)*(1-x^10)*(1-x^20)).at n=38A001305
- a(n) = n^4 + (9/2)*n^3 + n^2 - (9/2)*n + 1.at n=6A003878
- Number of unlabeled rooted nonseparable graphs with n nodes.at n=6A004115
- Coordination sequence T4 for Zeolite Code BOG.at n=34A008052
- Even triangular numbers.at n=33A014494
- a(n) = 2*n*(4*n - 1).at n=17A014635
- Number of partitions of n into distinct parts, none being 2.at n=51A015744
- Binomial coefficients C(n,66).at n=2A017730
- Binomial coefficients C(68,n).at n=2A017784
- Pseudoprimes to base 35.at n=12A020163
- Expansion of Product_{m>=1} (1 + m*q^m)^-4.at n=12A022696
- a(1) = 7; a(n+1) = a(n)-th composite.at n=21A025011
- Sum of numbers between the two n's in A026272.at n=44A026275
- n-th diagonal sum of right justified array T given by A027960.at n=15A027976
- (prime(n)-1)(prime(n)-3)/8.at n=31A030005
- a(n) = (prime(n)-3)*(prime(n)-5)/8.at n=32A030007
- 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 46.at n=13A031544
- Numbers whose set of base-9 digits is {1,3}.at n=22A032916
- Duplicate of A014635.at n=17A033588