3812
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
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 6678
- Proper Divisor Sum (Aliquot Sum)
- 2866
- 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
- 1904
- Möbius Function
- 0
- Radical
- 1906
- 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
- 30
- 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
- yes
- Odd
- no
Appears in sequences
- a(n) is the solution to the postage stamp problem with 4 denominations and n stamps.at n=20A001209
- a(n) = floor(n*phi^10), where phi is the golden ratio, A001622.at n=31A004925
- Coordination sequence T2 for Zeolite Code DAC.at n=39A008068
- Number of immersions of oriented circle into unoriented sphere with n double points.at n=7A008988
- Coordination sequence for FeS2-Pyrite, Fe position.at n=30A009957
- 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 30.at n=43A031528
- Coordination sequence T2 for Zeolite Code CFI.at n=41A033600
- Sum of first n primes of form 4k+1.at n=27A038346
- Numbers whose base-5 representation contains exactly two 1's and three 2's.at n=14A045228
- a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1 and a(2) = a(3) = 3.at n=13A049925
- Composite n such that phi(n+2) = phi(n)+2.at n=40A056774
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 81 ).at n=20A063354
- Indices of double-safe primes: p=prime(n) is double-safe: q=(p-1)/2 & r=(q-1)/2 are both prime (and q is safe).at n=39A075133
- Interprimes which are of the form s*prime, s=4.at n=17A075279
- Number of compositions of n into twin primes (i.e., primes that are members of a twin prime pair, like 3, 5, 7, 11, 13, but not 2 or 23).at n=38A077608
- a(0)=1; a(n) = sigma_1(n) + sigma_2(n) + sigma_3(n).at n=15A092347
- Numbers n occurring in binary representation of n*(n+1)/2.at n=28A092734
- Indices of primes in sequence defined by A(0) = 43, A(n) = 10*A(n-1) - 27 for n > 0.at n=10A101713
- a(n) = a(n-1)+a(n-2)-a(n-3)+a(n-5), n>7.at n=25A107287
- Numbers k such that the k-th and (k+1)-th primes have the same sum of squares of digits.at n=7A109182