2285
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2748
- Proper Divisor Sum (Aliquot Sum)
- 463
- 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
- 1824
- Möbius Function
- 1
- Radical
- 2285
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 32
- 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
- no
- Odd
- yes
Appears in sequences
- The convergent sequence C_n for the ternary continued fraction (3,1;2,2) of period 2.at n=11A000964
- Self-convolution of Fibonacci numbers.at n=14A001629
- Numbers whose square is a palindrome.at n=18A002778
- The generalized Conway-Guy sequence w^{0}.at n=13A006754
- Coordination sequence T1 for Zeolite Code CAS.at n=29A008063
- Coordination sequence for MgNi2, Position Mg2.at n=12A009935
- Nonpalindromic and "non-core" numbers that when squared give palindrome with odd number of digits.at n=3A016106
- Numbers k such that the continued fraction for sqrt(k) has period 11.at n=23A020350
- Base 6 expansion uses each positive digit just once.at n=14A023744
- a(n) = (1/2) * A027052(n, 2n-1).at n=9A027057
- Golc sequence in base 2. Left to right concatenation of n,int(log_2(n)),int(log_2(int(log_2(n)))),... in base 2.at n=34A028432
- Numbers k such that k^2 is a palindrome with an odd number of digits.at n=17A028816
- Numbers k such that k^2 contains only digits {1,2,5}.at n=13A031153
- Fractional part of square root of a(n) starts with 8: first term of runs.at n=45A034114
- Numbers whose square contains no loops in its digits (assumes 1, 2, 3, 5, 7 have no loops and 0, 4, 6, 8, 9 do).at n=33A034905
- Number of partitions of n such that cn(0,5) = cn(2,5) <= cn(3,5) = cn(4,5) < cn(1,5).at n=48A036847
- Denominators of continued fraction convergents to sqrt(550).at n=8A042053
- Numbers k such that string 5,5 occurs in the base 8 representation of k but not of k-1.at n=35A044232
- Numbers n such that string 1,8 occurs in the base 9 representation of n but not of n-1.at n=31A044268
- Numbers n such that string 8,5 occurs in the base 10 representation of n but not of n-1.at n=24A044417