3425
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 4278
- Proper Divisor Sum (Aliquot Sum)
- 853
- 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
- 2720
- Möbius Function
- 0
- Radical
- 685
- 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
- 56
- 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
- Set partitions without singletons: number of partitions of an n-set into blocks of size > 1. Also number of cyclically spaced (or feasible) partitions.at n=9A000296
- Numbers that are the sum of 2 squares in exactly 3 ways.at n=36A000443
- Coordination sequence T8 for Zeolite Code MFI.at n=37A008171
- Coordination sequence T3 for Zeolite Code -ROG.at n=44A009861
- Coordination sequence T4 for Zeolite Code ZON.at n=41A009922
- Numbers k such that the continued fraction for sqrt(k) has period 21.at n=24A020360
- a(n) = n*(11*n - 1)/2.at n=25A022268
- Numbers that are the sum of 2 nonzero squares in exactly 3 ways.at n=34A025286
- Numbers that are the sum of 2 distinct nonzero squares in exactly 3 ways.at n=33A025304
- Numbers that are the sum of 2 distinct nonzero squares in 3 or more ways.at n=43A025313
- a(n) = (d(n)-r(n))/5, where d = A026063 and r is the periodic sequence with fundamental period (1,4,0,0,0).at n=36A026065
- Clog sequence in base 2. Right to left concatenation of n,int(log_2(n)),int(log_2(int(log_2(n)))),... in base 2.at n=32A028423
- Nonsquarefree k such that Pell equation x^2 - k*y^2 = -1 is soluble.at n=30A031397
- Numbers of the form (q^2+(q+1)^2)*(r^2+(r+1)^2), q,r >= 1.at n=32A033682
- Number of partitions satisfying cn(1,5) + cn(4,5) <= cn(0,5).at n=38A039860
- Denominators of continued fraction convergents to sqrt(581).at n=9A042113
- Numbers whose base-15 representation has exactly 4 runs.at n=32A043671
- Numbers k such that the string 2,5 occurs in the base 9 representation of k but not of k-1.at n=47A044274
- Numbers n such that string 2,5 occurs in the base 10 representation of n but not of n-1.at n=38A044357
- Numbers n such that string 2,5 occurs in the base 10 representation of n but not of n+1.at n=38A044738