1018
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 10
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1530
- Proper Divisor Sum (Aliquot Sum)
- 512
- 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
- 508
- Möbius Function
- 1
- Radical
- 1018
- 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
- 49
- 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
- Numbers k such that 2*7^k - 1 is prime.at n=11A002959
- Number of Twopins positions.at n=13A005684
- Number of identity matched trees with n nodes.at n=8A005755
- Numbers k such that k^16 + 1 is prime.at n=49A006313
- Number of zeros in character table of symmetric group S_n.at n=10A006907
- Coordination sequence T3 for Zeolite Code AEL.at n=21A008006
- Coordination sequence T1 for Zeolite Code AFT.at n=24A008026
- Coordination sequence T6 for Zeolite Code MFS.at n=20A008178
- If a, b in sequence, so is ab+6.at n=15A009307
- Triangle of numbers arising from analysis of Levine's sequence A011784.at n=56A014621
- Numbers k such that phi(k) + 3 | sigma(k + 3).at n=48A015782
- Numbers k such that phi(k + 6) | sigma(k) + 6.at n=5A015872
- Numbers k such that the continued fraction for sqrt(k) has period 17.at n=8A020356
- Ordered sequence of distinct terms of the form floor(x^i * floor(x^j)), where x = sqrt(2).at n=54A022768
- Numbers with exactly 3 3's in their base-5 expansion.at n=19A023736
- a(n) = [ (2nd elementary symmetric function of P(n))/(first elementary symmetric function of P(n)) ], where P(n) = {1, p(1), p(2), ..., p(n-1)}, where p(0) = 1.at n=33A024531
- [ Sum{(log(j)-log(i))^2} ], 2 <= i < j <= n.at n=40A025206
- Index of 6^n within the sequence of the numbers of the form 6^i*7^j.at n=46A025716
- Index of 7^n within the sequence of the numbers of the form 7^i*10^j.at n=48A025727
- a(n) = n-th largest even number in array T given by A027170.at n=23A027183