1846
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
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 3024
- Proper Divisor Sum (Aliquot Sum)
- 1178
- 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
- 840
- Möbius Function
- -1
- Radical
- 1846
- 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
- 68
- 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
- Number of partitions with no even part repeated; partitions of n in which no parts are multiples of 4.at n=29A001935
- Related to partitions.at n=9A002040
- Numbers that are the sum of 12 positive 6th powers.at n=31A003368
- Number of sensed planar maps with n edges and without loops or isthmuses.at n=9A006398
- Coordination sequence T1 for Zeolite Code EPI.at n=27A008090
- Coordination sequence T1 for Zeolite Code LTL.at n=31A008138
- Coordination sequence T5 for Zeolite Code NON.at n=26A008216
- Coordination sequence T3 for Zeolite Code iRON.at n=30A009883
- Smallest positive number that can be written as sum of distinct Fibonacci numbers in n ways.at n=37A013583
- Composite numbers that are equal to the sum of the first k composites for some k.at n=38A013921
- Number of ordered 5-tuples of integers from [ 2,n ] with no common factors among quadruples.at n=10A015655
- Five iterations of Reverse and Add are needed to reach a palindrome.at n=43A015982
- Numbers k such that the continued fraction for sqrt(k) has period 34.at n=11A020373
- a(n) = s(1)*s(n) + s(2)*s(n-1) + ... + s(k)*s(n+1-k), where k = floor((n+1)/2), s = (natural numbers >= 3).at n=22A024312
- s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (odd natural numbers), t = A001950 (upper Wythoff sequence).at n=15A024600
- a(1) = 3; a(n+1) = a(n)-th nonprime, where nonprimes begin at 0.at n=24A025000
- s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (odd natural numbers), t = A001950 (upper Wythoff sequence).at n=14A025114
- Sequence satisfies T^2(a)=a, where T is defined below.at n=41A027591
- a(n) = n^2 - 3.at n=41A028872
- a(n) = floor(E_(n+1)/E_(n)) where E_n is n-th Euler number (see A028296 and A000364).at n=32A034971