1243
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 10
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1368
- Proper Divisor Sum (Aliquot Sum)
- 125
- 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
- 1243
- 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
- 70
- 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
- Boustrophedon transform of 1, 1, 4, 9, 16, ...at n=6A000697
- Numbers that are not the sum of 4 tetrahedral numbers.at n=52A000797
- Number of two-rowed partitions of length 3.at n=22A001993
- a(2*n) = floor( 17*2^n/14 ), a(2*n+1) = floor( 12*2^n/7 ).at n=20A003143
- Numbers that are the sum of 11 positive 6th powers.at n=20A003367
- Number of partitions of n into 3 or more parts.at n=22A004250
- Number of nonequivalent dissections of a polygon into n quadrilaterals by nonintersecting diagonals up to rotation and reflection.at n=7A005036
- Number of protruded partitions of n with largest part at most 2.at n=12A005403
- Odd numbers not of form p + 2^k (de Polignac numbers).at n=23A006285
- Coordination sequence T5 for Zeolite Code BOG.at n=25A008053
- Coordination sequence T4 for Zeolite Code HEU.at n=23A008119
- Numbers k such that C(k,3) = C(x,3) + C(y,3) is solvable.at n=36A010330
- a(n) = Sum_{k=1..n} k*phi(k).at n=17A011755
- Discriminants of imaginary quadratic fields with class number 4 (negated).at n=48A013658
- Apply partial sum operator twice to Stern's sequence.at n=10A014172
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite RTE = RUB-3 [Si24O48].2R starting with a T1 atom.at n=10A019225
- a(n+1) (n >= 1) is smallest number > a(n) which is the sum of cubes of distinct earlier terms.at n=26A019511
- Index of 5^n within sequence of numbers of form 2^i * 5^j.at n=32A022334
- Positive numbers k such that k and 3*k are anagrams in base 6 (written in base 6).at n=0A023065
- Katadromes: digits in base 6 are in strict descending order.at n=54A023788