3655
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 4752
- Proper Divisor Sum (Aliquot Sum)
- 1097
- 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
- 2688
- Möbius Function
- -1
- Radical
- 3655
- 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
- yes
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- yes
- 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
- 118
- 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
- Hexagonal numbers: a(n) = n*(2*n-1).at n=43A000384
- Bessel polynomial y_n(-1).at n=6A000806
- Numbers that are the sum of 3 nonnegative cubes in more than 1 way.at n=37A001239
- Number of ways in which n identical balls can be distributed among 5 boxes in a row such that each pair of adjacent boxes contains at least 4 balls.at n=11A005338
- Numbers k such that k, k+1, k+2 and k+3 have the same number of divisors.at n=1A006601
- Coordination sequence T4 for Zeolite Code DOH.at n=37A008081
- Molien series for alternating group Alt_12 (or A_12).at n=29A008635
- Number of partitions of n into at most 12 parts.at n=29A008641
- Numbers that are the sum of 3 positive cubes in more than one way.at n=26A008917
- a(n) = floor(n*(n-1)*(n-2)/15).at n=39A011897
- Odd triangular numbers.at n=42A014493
- a(n) = (2*n+1)*(4*n+1).at n=21A014634
- Triangle of Gaussian (or q-binomial) coefficients for q = -2.at n=42A015109
- Triangle of Gaussian (or q-binomial) coefficients for q = -2.at n=38A015109
- Gaussian binomial coefficient [ n,2 ] for q = -2.at n=6A015249
- Gaussian binomial coefficient [ n,6 ] for q = -2.at n=2A015323
- Number of 5-tuples of different integers from [ 1,n ] with no common factors among pairs.at n=26A015698
- Binomial coefficients C(n,84).at n=2A017748
- Binomial coefficients C(86,n).at n=2A017802
- Pseudoprimes to base 16.at n=34A020144