3693
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
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4928
- Proper Divisor Sum (Aliquot Sum)
- 1235
- 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
- 2460
- Möbius Function
- 1
- Radical
- 3693
- Omega Function (Ω)
- 2
- 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
- 69
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- Coordination sequence T3 for Zeolite Code AET.at n=42A008009
- From George Gilbert's marks problem: jumping 5 marks at a time (initial positions).at n=10A019993
- Numbers k such that the continued fraction for sqrt(k) has period 62.at n=4A020401
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 40.at n=18A031538
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 26 ones.at n=27A031794
- Coordination sequence T3 for Zeolite Code SBS.at n=48A033610
- Smallest of three consecutive squarefree numbers k, k+1, k+2 of the form p*q where p and q are distinct primes.at n=38A039833
- Numerators of continued fraction convergents to sqrt(461).at n=3A041878
- Numerators of continued fraction convergents to sqrt(771).at n=5A042486
- For each prime p take the sum of nonprimes < p.at n=24A045717
- a(n)=T(n,n+2), array T as in A049723.at n=33A049730
- Nonprime numbers n such that n and n-reversed (<>n and no leading zeros) have the same number of prime factors and these prime factors (palindromes allowed here) are also reversals of each other.at n=45A050702
- Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 22.at n=19A051963
- Expansion of (1-x^2)/(1-2x-2x^2+x^3+x^4).at n=9A052988
- Number of subsequences of {1..n} such that all differences of pairs of terms are distinct (i.e., number of Golomb rulers on {1..n}).at n=17A054578
- Positive numbers k such that, in base 3, 2^k and 2^(k+1) have the same number of digits and the same number of 0's.at n=46A056734
- Numbers k such that k, k+1 and k+2 are products of two primes.at n=40A056809
- Number of homeomorphically irreducible general graphs on 3 labeled node and with n edges.at n=11A060578
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 63 ).at n=34A063336
- Difference between the sum of first n prime numbers and the sum of first n composite numbers.at n=52A072476