12358
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 19152
- Proper Divisor Sum (Aliquot Sum)
- 6794
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5976
- Möbius Function
- -1
- Radical
- 12358
- 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
- 37
- 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
- a(1) = 7; a(n+1) = a(n)-th nonprime, where nonprimes begin at 0.at n=35A025002
- Numbers that appear exactly five times in A101402. (Also indices of fives in A101403.).at n=8A129117
- a(n) = 9*n^2 + n.at n=36A154517
- a(n) = 1369*n^2 + 37.at n=3A158741
- Number of composites removed in each step of the Sieve of Eratosthenes for 10^7.at n=24A227155
- Products of any two not necessarily distinct terms of A237424.at n=40A254143
- Number of length 4 1..(n+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal.at n=17A254221
- Remove in decimal representation of A254143(n) all repeated digits.at n=40A254323
- The chalcogen sequence (a(n) = A018227(n)-2).at n=38A271994
- Numbers k such that (68*10^k - 11)/3 is prime.at n=18A293399
- a(n) = pi(n) * (Sum_{n <= q < 2n, q prime} q) + (pi(2n-1) - pi(n-1)) * (Sum_{p <= n, p prime} p).at n=44A352775
- a(n) = pi(n) * (Sum_{n <= q < 2n, q prime} q) + (pi(2n-1) - pi(n-1)) * (Sum_{p <= n, p prime} p).at n=45A352775
- a(n) is the least positive integer that has exactly n anagrams that are semiprimes, or -1 if there is no such integer.at n=37A362499
- A382168 with duplicates removed.at n=30A382169