2900
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 18
- Divisor Sum
- 6510
- Proper Divisor Sum (Aliquot Sum)
- 3610
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1120
- Möbius Function
- 0
- Radical
- 290
- Omega Function (Ω)
- 5
- 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
- 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
- 22
- 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
- yes
- Odd
- no
Appears in sequences
- Numbers that are the sum of 2 squares in exactly 3 ways.at n=30A000443
- a(n) = (n-1)*n*(n+4)/6.at n=25A005581
- McKay-Thompson series of class 6E for Monster (and, apart from signs, of class 12B).at n=33A007258
- If a, b in sequence, so is ab+7.at n=26A009312
- Coordination sequence T6 for Zeolite Code DFO.at n=41A009880
- Numerator of sum of -2nd powers of divisors of n.at n=50A017667
- a(n) = floor( Gamma(n + 4/5)/Gamma(4/5) ).at n=7A020082
- a(0)=0, a(2*n) = 2*a(n) + 2*a(n-1) + n^2 + n, a(2*n+1) = 4*a(n) + (n+1)^2.at n=44A022560
- Long leg of more than one primitive Pythagorean triangle.at n=21A024410
- Numbers that are the sum of 2 nonzero squares in exactly 3 ways.at n=28A025286
- Numbers that are the sum of 2 nonzero squares in 3 or more ways.at n=36A025294
- Numbers that are the sum of 2 distinct nonzero squares in exactly 3 ways.at n=27A025304
- Numbers that are the sum of 2 distinct nonzero squares in 3 or more ways.at n=35A025313
- a(n) = (d(n)-r(n))/2, where d = A026054 and r is the periodic sequence with fundamental period (1,0,0,0).at n=27A026055
- a(n) = Sum_{k=0..n} A026626(n, k).at n=11A026633
- a(n) = A027170(2n-1, n-2).at n=4A027176
- a(n) = n-th largest even number in array T given by A027170.at n=41A027183
- Numbers k such that k^2 has digits in nonincreasing order.at n=27A028821
- Number of n-celled polyplets without bilateral symmetry.at n=6A030235
- Values of Newton-Gregory forward interpolating polynomial (1/3)*(n-1)*(2*n+3)*(2*n-1).at n=13A030440