2445
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 3936
- Proper Divisor Sum (Aliquot Sum)
- 1491
- 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
- 1296
- Möbius Function
- -1
- Radical
- 2445
- 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
- 40
- 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
- no
- Odd
- yes
Appears in sequences
- Smallest k such that the product of q/(q-1) over the primes from prime(n) to prime(n+k-1) is greater than 2.at n=33A001276
- Numbers that are the sum of 9 positive 6th powers.at n=31A003365
- Numbers that are the sum of 5 positive 7th powers.at n=8A003372
- Numbers that are the sum of at most 5 positive 7th powers.at n=32A004867
- Numbers that are the sum of at most 6 positive 7th powers.at n=41A004868
- Numbers that are the sum of at most 7 positive 7th powers.at n=51A004869
- Truncated tetrahedral numbers: a(n) = (1/6)*(n+1)*(23*n^2 + 19*n + 6).at n=8A005906
- Alkane (or paraffin) numbers l(7,n).at n=16A005994
- Numbers n such that n! has a square number of digits.at n=40A006488
- Coordination sequence T4 for Zeolite Code DAC.at n=31A008070
- Sequence satisfies T(a)=a, where T is defined below.at n=42A027597
- Numbers k such that k^2 is palindromic in base 14.at n=17A030072
- Lucky numbers with size of gaps equal to 16 (lower terms).at n=7A031898
- Number of dyslexic planted planar trees with n+1 nodes where any 2 subtrees extending from the same node are different.at n=12A032065
- Number of indecomposable binary [ n,3 ] codes without 0 columns.at n=21A034350
- Numbers n such that string 1,5 occurs in the base 8 representation of n but not of n-1.at n=43A044200
- Numbers n such that string 1,6 occurs in the base 9 representation of n but not of n-1.at n=34A044266
- Numbers n such that string 4,5 occurs in the base 10 representation of n but not of n-1.at n=26A044377
- Numbers k such that string 1,5 occurs in the base 8 representation of k but not of k+1.at n=43A044581
- Numbers k such that string 1,6 occurs in the base 9 representation of k but not of k+1.at n=34A044647