2486
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 5
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 4104
- Proper Divisor Sum (Aliquot Sum)
- 1618
- 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
- 1120
- Möbius Function
- -1
- Radical
- 2486
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 71
- 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
- Let A(n) = #{(i,j,k): i^2 + j^2 + k^2 <= n}, V(n) = (4/3)Pi*n^(3/2), P(n) = A(n) - V(n); sequence gives values of n where |P(n)| sets a new record.at n=28A000092
- Denominators of convergents to cube root of 5.at n=8A002357
- A nonlinear recurrence.at n=32A003073
- a(2*n) = floor( 17*2^n/14 ), a(2*n+1) = floor( 12*2^n/7 ).at n=22A003143
- Reverse digits of number of partitions of n.at n=31A004089
- Number of indefinitely growing n-step self-avoiding walks on Manhattan lattice.at n=13A006745
- Coordination sequence T4 for Zeolite Code EMT.at n=41A008089
- Coordination sequence T4 for Zeolite Code MEL.at n=32A008153
- Coordination sequence T7 for Zeolite Code MEL.at n=32A008156
- Coordination sequence T7 for Zeolite Code MTT.at n=31A008195
- Coordination sequence T1 for Zeolite Code RTE.at n=34A009890
- Numbers k such that sigma(k) = sigma(k+13).at n=3A015883
- Numbers k such that k | 7^k + 7.at n=20A015893
- Nine iterations of Reverse and Add are needed to reach a palindrome.at n=8A015990
- Number of balls in pyramid with base either a regular hexagon or a hexagon with alternate sides differing by 1 (balls in hexagonal pyramid of height n taken from hexagonal close-packing).at n=21A019298
- Pseudoprimes to base 49.at n=42A020177
- Convolution of A001950 and A014306.at n=46A023669
- a(n) = least m such that if r and s in {1/1, 1/3, 1/5,..., 1/(2n-1)} satisfy r < s, then r < k/m < s for some integer k.at n=40A024819
- Bisection of A028289.at n=30A038390
- Numbers whose base-7 representation contains exactly three 1's.at n=35A043399