12418
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 21312
- Proper Divisor Sum (Aliquot Sum)
- 8894
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5316
- Möbius Function
- -1
- Radical
- 12418
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 156
- 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
- Initial pile sizes which guarantee a win for player 2 in a certain variant of Nim.at n=40A016741
- Numbers k such that 103*2^k+1 is prime.at n=13A032401
- Number of days in n years (n=4 is the first leap year).at n=33A033171
- Number of days in n years (n=3 is the first leap year).at n=33A033172
- Least numbers m such that GCD of two consecutive values of cototients, i.e., gcd(cototient(m+1), cototient(m)) equals 2n - 1.at n=33A070017
- a(n) = floor((n+2)^(n+2)/n^n).at n=40A078111
- Number of permutations of floor(i*7/4), i=0..n-1, with all sums of two and three adjacent terms respectively unique.at n=7A147895
- a(n) = 343*n - 273.at n=36A157369
- Number of compositions of n into distinct parts with exactly ten descents.at n=15A241729
- Numbers for which the cube of the sum of the digits is equal to the square of the product of their digits.at n=12A241846
- The number of ways in which n is equal to the sum of digits taken from the numbers <= n.at n=15A245439
- Indices of even terms in A249064.at n=38A249557
- Increase in the number of free polyominoes from order n to n+1.at n=10A283109
- Number of partitions of n with even minimal and maximal parts.at n=49A325346
- Sum of the fourth largest parts of the partitions of n into 10 squarefree parts.at n=51A326634
- a(n) is the determinant of the 2 X 2 matrix whose entries (when read by rows) are the n-th primes ending in 1, 3, 7, 9 respectively.at n=9A335592
- Numbers k that have the same set of digits in base 10 as primepi(k).at n=44A355418
- The number of 3-permutations that avoid the patterns 132 and 213.at n=12A356728