1558
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 2520
- Proper Divisor Sum (Aliquot Sum)
- 962
- 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
- 720
- Möbius Function
- -1
- Radical
- 1558
- Omega Function (Ω)
- 3
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 60
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- a(n) = floor(sqrt( 2*Pi )^n).at n=8A001674
- Number of Hamiltonian paths in D_4 X P_n.at n=3A003760
- Numbers k such that k^64 + 1 is prime.at n=14A006316
- Coordination sequence T3 for Zeolite Code AEL.at n=26A008006
- Coordination sequence T3 for Zeolite Code MFI.at n=25A008166
- a(n) = floor(n*(n-1)*(n-2)/21).at n=33A011903
- a(n) = n*nextprime(n).at n=38A013636
- Numbers n such that phi(n) * sigma(n) + 9 is a perfect square.at n=22A015728
- Pseudoprimes to base 83.at n=23A020211
- Numbers whose base-9 representation is the juxtaposition of two identical strings.at n=18A020337
- Numbers k such that the continued fraction for sqrt(k) has period 22.at n=31A020361
- Convolution of Fibonacci numbers and composite numbers.at n=10A023609
- Index of 8^n within the sequence of the numbers of the form 7^i*8^j.at n=53A025731
- a(n) = number of integer strings s(0),...,s(n) counted by array T in A026374 that have s(n)=1; also a(n) = T(2n-1,n-1).at n=5A026378
- a(n) = T(n,[ n/2 ]), where T is the array in A026374.at n=10A026380
- T(n,n-2), where T is the array in A026374.at n=36A026381
- T(n,[ n/2 ]), where T is the array in A026386.at n=10A026392
- a(n) = n*(n+3).at n=38A028552
- Positions of record values in A030777.at n=36A030782
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 38.at n=11A031536