1695
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 2736
- Proper Divisor Sum (Aliquot Sum)
- 1041
- 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
- 896
- Möbius Function
- -1
- Radical
- 1695
- 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
- 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
- 179
- 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
- no
- Odd
- yes
Appears in sequences
- Number of partitions of n into prime parts.at n=58A000607
- MacMahon's generalized sum of divisors function.at n=21A002127
- Number of permutations p on the set [n] with the properties that abs(p(i)-i) <= 3 for all i and p(1) <= 3.at n=8A002527
- Divisors of 2^28 - 1.at n=19A003536
- Rhombic dodecahedral numbers: a(n) = n^4 - (n - 1)^4.at n=7A005917
- a(n) = n*(n^2 + 1)/2.at n=15A006003
- 4-dimensional analog of centered polygonal numbers.at n=8A006322
- Coordination sequence T3 for Zeolite Code EMT.at n=34A008088
- Coordination sequence T3 for Zeolite Code GOO.at n=28A008113
- Coordination sequence T7 for Zeolite Code MFI.at n=26A008170
- Coordination sequence T5 for Zeolite Code MTW.at n=27A008200
- Coordination sequence T1 for Zeolite Code STI.at n=28A008234
- Crystal ball sequence for planar net 3.6.3.6.at n=27A008580
- Numbers k such that sigma(k) = sigma(k+7).at n=10A015867
- a(n) = 8^n - 7^n.at n=4A016177
- Fermat pseudoprimes to base 4.at n=14A020136
- Pseudoprimes to base 16.at n=20A020144
- Pseudoprimes to base 49.at n=35A020177
- Strong pseudoprimes to base 16.at n=10A020242
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly five 1's.at n=16A020441