4887
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 27
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 7280
- Proper Divisor Sum (Aliquot Sum)
- 2393
- 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
- 0
- Radical
- 543
- Omega Function (Ω)
- 4
- 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
- yes
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 46
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers that are the sum of 7 positive 7th powers.at n=19A003374
- For any circular arrangement of 0..n-1, let S = sum of squares of every sum of two contiguous numbers; then a(n) = # of distinct values of S.at n=30A007773
- Coordination sequence T7 for Zeolite Code DDR.at n=44A008077
- Every suffix prime and no 0 digits in base 9 (written in base 9).at n=35A024784
- Numbers k that divide the (left) concatenation of all numbers <= k written in base 19 (most significant digit on left).at n=29A029488
- Gessel-Stanley triangle read by rows: triangle of coefficients of polynomials arising in connection with enumeration of intransitive trees by number of nodes and number of right nodes.at n=26A029847
- Gessel-Stanley triangle read by rows: triangle of coefficients of polynomials arising in connection with enumeration of intransitive trees by number of nodes and number of right nodes.at n=24A029847
- Numbers whose set of base-6 digits is {3,4}.at n=40A032830
- Odd numbers with exactly 4 palindromic prime factors (counted with multiplicity).at n=35A046374
- Coordination sequence T1 for Zeolite Code SFE.at n=46A057317
- Coordination sequence T5 for Zeolite Code SFE.at n=46A057321
- Numbers k such that Euler phi(k) / Carmichael lambda(k) = 18.at n=25A066697
- Numbers which yield a prime whenever a 1 is inserted anywhere in them (including at the beginning or end).at n=51A068679
- Numbers k such that gcd(k, reverse(k)) = 27 = 3^3, where reverse(x) = A004086(x).at n=5A072016
- Numbers k such that the k-th term of the EKG sequence (A064413(k)) has more than one controlling prime.at n=20A073735
- Numbers k such that 3*k! + 1 is prime.at n=18A076679
- Expansion of (1-x)/(1-2*x+x^2+x^3).at n=23A078001
- Expansion of (1-x)/(1 + x^2 - x^3).at n=44A078031
- a(n) is the least positive integer such that nextprime(a(n)^n) - prevprime(a(n)^n) = 4.at n=45A090125
- Floor of area of triangle with consecutive prime sides.at n=26A096377