3087
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 5200
- Proper Divisor Sum (Aliquot Sum)
- 2113
- 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
- 1764
- Möbius Function
- 0
- Radical
- 21
- Omega Function (Ω)
- 5
- 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
- 110
- 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
- yes
- Achilles Number
- yes
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of alkyls X^{II} C_n H_{2n+1} Y with n carbon atoms.at n=9A000645
- Double-bitters: only even length runs in binary expansion.at n=35A001196
- Numbers k such that 17*2^k + 1 is prime.at n=11A002259
- Numbers that are the sum of 12 positive 7th powers.at n=20A003379
- Numbers of the form 3^i*7^j with i, j >= 0.at n=21A003594
- Sum of the first n primes.at n=40A007504
- Coordination sequence T1 for Zeolite Code MON.at n=34A008181
- Coordination sequence T1 for Zeolite Code VNI.at n=34A009907
- Super-3 Numbers (3n^3 contains substring '333' in its decimal expansion).at n=24A014569
- Numbers k that divide s(k), where s(1)=1, s(j)=9*s(j-1)+j.at n=23A014857
- Numbers k that divide s(k), where s(1)=1, s(j)=18*s(j-1)+j.at n=44A014868
- Numbers k such that k divides 4^k - 1.at n=26A014945
- Integers k such that k divides 22^k - 1.at n=34A014959
- Odd numbers k that divide 25^k - 1.at n=34A014962
- Numbers k such that k | 5^k + 1.at n=26A015951
- Coordination sequence T2 for Zeolite Code CZP.at n=36A019457
- The differences 1-1, 21-12, 321-123, ..., 10987654321-12345678910, 1110987654321-1234567891011, etc.at n=3A019566
- a(n) = n*(19*n + 1)/2.at n=18A022277
- Expansion of Product_{m>=1} (1+m*q^m)^-21.at n=4A022713
- Coordination sequence T3 for Zeolite Code IFR.at n=39A024984