4149
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
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 6006
- Proper Divisor Sum (Aliquot Sum)
- 1857
- 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
- 2760
- Möbius Function
- 0
- Radical
- 1383
- Omega Function (Ω)
- 3
- 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
- 126
- 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 2 positive 5th powers.at n=13A003347
- Numbers that are the sum of at most 2 positive 5th powers.at n=19A004842
- Numbers that are the sum of at most 3 positive 5th powers.at n=45A004843
- 5-dimensional centered cube numbers.at n=4A008515
- Numbers k such that the continued fraction for sqrt(k) has period 60.at n=14A020399
- Positive numbers k such that k = x^5 + y^5 has a solution in nonzero integers x, y.at n=23A020896
- a(n) = T(n,2n-2), T given by A027023.at n=8A027051
- Concatenation of n-th prime number and n-th lucky number.at n=12A032603
- Concatenation of n and n + 8 or {n,n+8}.at n=40A032613
- Nearest integer to n^(5/2).at n=28A036488
- Numerators of continued fraction convergents to sqrt(190).at n=9A041352
- Base-6 palindromes that start with 3.at n=21A043012
- Numbers whose base-16 representation has exactly 4 runs.at n=34A043677
- Numbers whose base-4 representation contains exactly three 0's and three 1's.at n=15A045031
- a(1) = 9; a(n) is smallest number >= a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime.at n=29A046259
- n satisfying sigma(n+1) = sigma(n-1).at n=12A055574
- Positive numbers whose product of digits is 8 times their sum.at n=36A062040
- Numbers k such that sigma(k-1) divides sigma(k+1).at n=16A067130
- Second convolution of A001045(n+1) (generalized (1,2)-Fibonacci), n>=0, with itself.at n=8A073372
- a(n) = 4^n + 5^n.at n=5A074611