3787
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4336
- Proper Divisor Sum (Aliquot Sum)
- 549
- 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
- 3240
- Möbius Function
- 1
- Radical
- 3787
- 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
- 82
- 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 T1 for Zeolite Code AST.at n=45A008036
- Coordination sequence T6 for Zeolite Code DFO.at n=47A009880
- Powers of sqrt(3) rounded down.at n=15A017913
- Powers of fourth root of 3 rounded down.at n=30A018051
- Ordered sequence of distinct terms of the form floor(x^i * floor(x^j)), i,j >= 0, where x = sqrt(3).at n=40A022769
- a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = A000201 (lower Wythoff sequence).at n=24A024685
- Square root of A030681.at n=31A030682
- Number of labeled rooted trees on 2n+1 nodes each node having an even number of children.at n=3A036778
- Number of partitions satisfying cn(1,5) + cn(4,5) <= 1.at n=40A039856
- Numbers whose base-5 representation contains exactly three 1's and two 2's.at n=16A045231
- Starting positions of strings of 2 4's in the decimal expansion of Pi.at n=35A050230
- Numbers k such that k and 3^k end with the same two digits.at n=37A067749
- Sum of odd-indexed primes.at n=29A077131
- Average of terms in n-th row of A077316.at n=38A077319
- a(n) = 2*n^2 - 2*n + 3.at n=43A097080
- a(n) = 97*n + 101.at n=38A100775
- The sum of the first n primes, minus n.at n=43A101301
- Triangular matchstick numbers in the class of prime numbers: sum of n-th and next n primes.at n=23A105720
- 1 + sum of first n 3-almost primes.at n=41A110209
- Numbers n such that the coefficient of x^n in (x^2-x-1)^n is prime.at n=10A112874