4018
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 7182
- Proper Divisor Sum (Aliquot Sum)
- 3164
- 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
- 1680
- Möbius Function
- 0
- Radical
- 574
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
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
- 25
- 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
- Coordination sequence occurring in Zeolite Codes AFG, CAN, LIO, LOS.at n=44A008013
- Coordination sequence T1 for Zeolite Code APD.at n=42A008034
- Coordination sequence T2 for Zeolite Code APD.at n=42A008035
- a(n) = 2^n - n*(n+1)/2.at n=12A014833
- Numbers whose base-3 representation is the juxtaposition of two identical strings.at n=48A020331
- Number of days in n years (n=3 is the first leap year).at n=10A033172
- Number of days in n years (n=2 is the first leap year).at n=10A033173
- Number of days in n years (n=1 is the first leap year).at n=10A033174
- Denominators of continued fraction convergents to sqrt(70).at n=9A041123
- House numbers (version 2): a(n) = (n+1)^3 + (n+1)*Sum_{i=0..n} i.at n=13A050509
- Positions in decimal expansion of Pi where next prime begins.at n=30A053013
- Numbers n such that n | 3^n + 2^n + 1^n.at n=16A056645
- Numbers n such that n | 6^n + 4^n + 2^n.at n=44A057844
- Triangle read by rows: number of commutative monoids of order n with k idempotents.at n=29A058142
- Number of commutative monoids of order n with 2 idempotents.at n=6A058143
- Coefficients of replicable function number 49a.at n=50A058700
- Numbers k such that k^2 has property that the sum of its digits and the product of its digits are nonzero squares.at n=40A061268
- Number of n-digit terms of A070153.at n=35A071297
- Numbers k such that average of prime(k) and prime(k+1) is a perfect square.at n=27A076692
- a(n) = sum of n-th row of the triangle pertaining to A079774(n).at n=40A079776