1618
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2430
- Proper Divisor Sum (Aliquot Sum)
- 812
- 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
- 808
- Möbius Function
- 1
- Radical
- 1618
- 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
- 47
- 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
- yes
- Odd
- no
Appears in sequences
- Number of centered trees with n nodes.at n=14A000676
- Positions of remoteness 4 in Beans-Don't-Talk.at n=18A005696
- Coordination sequence T7 for Zeolite Code DDR.at n=25A008077
- Coordination sequence T3 for Zeolite Code TON.at n=25A008243
- Coordination sequence T1 for Banalsite.at n=24A008249
- Coordination sequence T2 for Banalsite.at n=24A008250
- Coordination sequence T2 for Cordierite.at n=24A008252
- Coordination sequence T2 for Milarite.at n=25A008257
- Coordination sequence T2 for Zeolite Code -WEN.at n=29A009863
- Coordination sequence T3 for Zeolite Code RTH.at n=28A009895
- Coordination sequence T4 for Zeolite Code VNI.at n=25A009910
- Coordination sequence for FeS2-Marcasite, S position.at n=21A009954
- Numbers k such that the continued fraction for sqrt(k) has period 9.at n=16A010339
- Decimal expansion of phi truncated to n places.at n=3A011551
- Decimal expansion of phi rounded to n places.at n=3A011552
- Numbers n such that phi(n) + 8 | sigma(n + 8), where phi = A000010 and sigma = A000203.at n=48A015787
- a(n) = round(e^(e^n)).at n=2A016066
- Expansion of 1/(1-x^7-x^8-x^9-x^10).at n=57A017859
- Powers of fifth root of 14 rounded down.at n=14A018153
- a(n) = prime(2^n)-1.at n=8A018249