2725
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 3410
- Proper Divisor Sum (Aliquot Sum)
- 685
- 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
- 2160
- Möbius Function
- 0
- Radical
- 545
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 66
- 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
- Numbers that are the sum of 2 squares in exactly 3 ways.at n=26A000443
- Number of fixed polyominoes with n cells.at n=8A001168
- Powers of 2 written in base 9.at n=11A001357
- Number of planar partitions of n decreasing across rows.at n=17A003293
- Coordination sequence T4 for Zeolite Code DAC.at n=33A008070
- Coordination sequence T1 for Zeolite Code HEU.at n=34A008116
- Coordination sequence T4 for Zeolite Code HEU.at n=34A008119
- Numbers k such that the continued fraction for sqrt(k) has period 9.at n=22A010339
- Erroneous version of A001168.at n=7A014559
- Powers of fifth root of 3 rounded up.at n=36A018122
- Powers of the fifth root of 9 rounded up.at n=18A018140
- First time that the Grundy function G(x) for "subtract-a-Fibonacci-number" takes the value n.at n=11A019307
- Pseudoprimes to base 68.at n=41A020196
- Pseudoprimes to base 76.at n=39A020204
- Strong pseudoprimes to base 68.at n=14A020294
- Fibonacci sequence beginning 1, 30.at n=11A022400
- Place where n-th 1 occurs in A023133.at n=41A022795
- Numbers that are the sum of 2 nonzero squares in exactly 3 ways.at n=24A025286
- Numbers that are the sum of 2 nonzero squares in 3 or more ways.at n=32A025294
- Numbers that are the sum of 2 distinct nonzero squares in exactly 3 ways.at n=23A025304