2494
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
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 3960
- Proper Divisor Sum (Aliquot Sum)
- 1466
- 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
- 1176
- Möbius Function
- -1
- Radical
- 2494
- 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
- 133
- 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) is the solution to the postage stamp problem with n denominations and 5 stamps.at n=12A001215
- Number of n-bead bracelets (turnover necklaces) of two colors with 10 red beads and n-10 black beads.at n=9A005515
- Numbers k such that k^64 + 1 is prime.at n=26A006316
- Number of connected unit interval graphs with n nodes; also number of bracelets (turnover necklaces) with n black beads and n-1 white beads.at n=9A007123
- Coordination sequence T2 for Zeolite Code EMT.at n=41A008087
- Coordination sequence T4 for Zeolite Code GOO.at n=34A008114
- Coordination sequence T3 for Zeolite Code MFS.at n=31A008175
- Minimal number of people to give a 50% probability of having at least n coincident birthdays in one year.at n=15A014088
- Numbers n such that phi(n) * sigma(n) + 4 is a perfect square.at n=39A015727
- Numbers k such that the continued fraction for sqrt(k) has period 46.at n=12A020385
- Pisot sequence T(4,6), a(n) = floor(a(n-1)^2/a(n-2)).at n=23A020747
- Pisot sequence T(6,9), a(n) = floor(a(n-1)^2/a(n-2)).at n=22A020751
- a(n) = a(n-1) + a(n-2) + 1 for n>1, a(0)=0, a(1)=5.at n=14A022310
- Positive integers which apparently never result in a palindrome under repeated applications of the function A056964(x) = x + (x with digits reversed).at n=26A023108
- Convolution of A023532 and Lucas numbers.at n=14A023597
- a(n) = 1*t(n) + 2*t(n-1) + ... + k*t(n+1-k), where k=floor((n+1)/2) and t = A002808 (composite numbers).at n=24A023863
- a(1) = 3; a(n+1) = a(n)-th nonprime, where nonprimes begin at 1.at n=24A025004
- [ Sum (s(j) - s(i))^3 ], 1 <= i < j <= n, where s(k) = 1 + 1/2 + ... + 1/k.at n=42A025217
- Index of 9^n within the sequence of the numbers of the form 2^i*9^j.at n=39A025734
- a(n) = n-th largest even number in array T given by A027170.at n=39A027183