2103
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 6
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2808
- Proper Divisor Sum (Aliquot Sum)
- 705
- 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
- 1400
- Möbius Function
- 1
- Radical
- 2103
- Omega Function (Ω)
- 2
- 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
- 94
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- Convolution of composite numbers and odd numbers.at n=13A023650
- Number of distinct products i*j with 0 <= i, j <= n-th prime.at n=22A027419
- 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 15.at n=16A031513
- Numbers whose base-2 and base-10 expansions have the same digit sum.at n=41A037308
- Positive numbers having the same set of digits in base 4 and base 10.at n=14A037428
- Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,1,0,3.at n=3A037736
- Numbers k such that the string 6,3 occurs in the base 7 representation of k but not of k-1.at n=48A044183
- Numbers n such that string 6,7 occurs in the base 8 representation of n but not of n-1.at n=32A044242
- Numbers n such that string 8,6 occurs in the base 9 representation of n but not of n-1.at n=27A044329
- Numbers k such that the string 0,3 occurs in the base 10 representation of k but not of k-1.at n=22A044335
- Numbers n such that string 0,6 occurs in the base 8 representation of n but not of n+1.at n=35A044574
- Numbers n such that string 6,7 occurs in the base 8 representation of n but not of n+1.at n=32A044623
- Numbers n such that string 8,6 occurs in the base 9 representation of n but not of n+1.at n=27A044710
- Numbers n such that string 0,3 occurs in the base 10 representation of n but not of n+1.at n=22A044716
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 6.at n=42A051971
- Number of noncaterpillar trees on n nodes (A000055-A005418).at n=13A052471
- Open 3-dimensional ball numbers (version 1): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (0,0,0).at n=16A053592
- McKay-Thompson series of class 21C for the Monster group.at n=16A058565
- Integer part of (Product(n^((1 + log(i))/i^2), {i, 1, n})).at n=25A062482
- Numbers n such that triples generated by {2*(n-1),2*n,2*(n+1)} form A007534.at n=11A072254