2675
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
- 6
- Divisor Sum
- 3348
- Proper Divisor Sum (Aliquot Sum)
- 673
- 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
- 2120
- Möbius Function
- 0
- Radical
- 535
- Omega Function (Ω)
- 3
- 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
- 45
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- Let A(n) = #{(i,j,k): i^2 + j^2 + k^2 <= n}, V(n) = (4/3)Pi*n^(3/2), P(n) = A(n) - V(n); A000092 gives values of n where |P(n)| sets a new record; sequence gives (nearest integer to, I believe) P(A000092(n)).at n=46A000223
- Coordination sequence T1 for Zeolite Code AFO.at n=34A008015
- Coordination sequence T2 for Zeolite Code AFT.at n=39A008027
- Coordination sequence T1 for Zeolite Code RSN.at n=34A009885
- Coordination sequence for FeS2-Pyrite, S position.at n=25A009956
- Numerator of the coefficient [x^(2n+1)] of the Taylor series tan(cosec(x)-coth(x)).at n=3A013539
- Expansion of 1/((1-4*x)*(1-7*x)*(1-8*x)).at n=3A019512
- a(n) = Sum_{i=0..n} Sum_{j=0..i} T(i,j), T given by A026536.at n=9A026550
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 15 ones.at n=1A031783
- Numerators of continued fraction convergents to sqrt(430).at n=6A041818
- Numbers n such that string 0,2 occurs in the base 9 representation of n but not of n-1.at n=35A044253
- Numbers n such that string 7,5 occurs in the base 10 representation of n but not of n-1.at n=28A044407
- Numbers n such that string 0,2 occurs in the base 9 representation of n but not of n+1.at n=35A044634
- Numbers n such that string 7,5 occurs in the base 10 representation of n but not of n+1.at n=28A044788
- Starting index of a string of 3 or more consecutive equal digits in decimal expansion of Pi.at n=21A049515
- Starting index of a string of exactly 3 consecutive equal digits in decimal expansion of Pi.at n=15A049519
- Starting positions of strings of 2 5's in the decimal expansion of Pi.at n=29A050238
- Series for first parallel moment of square lattice bond percolation near a wall.at n=10A056575
- Positions at which powers of 2 occur in A057929. (Or -1 if it does not occur.)at n=17A057931
- Numbers k such that 7*2^k + 5 is prime.at n=14A058595