11858
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 18
- Divisor Sum
- 22743
- Proper Divisor Sum (Aliquot Sum)
- 10885
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 4620
- Möbius Function
- 0
- Radical
- 154
- Omega Function (Ω)
- 5
- 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
- 187
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- Oscillates under partition transform.at n=48A007211
- a(1) = 3; a(n+1) = a(n)-th nonprime, where nonprimes begin at 0.at n=37A025000
- Numbers k such that 49*2^k+1 is prime.at n=14A032374
- G.f.: A(x) = (1/2)*x*(B(x)^2+B(x^2)), where B(x) = g.f. for A000600.at n=19A036674
- Numbers k such that 27*2^k-1 is prime.at n=30A050539
- Maximum number of regions into which the plane can be divided using n (concave) quadrilaterals.at n=39A077591
- Convolution of the prime numbers with phi(n) convoluted with sigma(n).at n=14A086735
- Total number of largest parts in all compositions of n.at n=13A097979
- Number of partitions of n into {number of partitions of n into "number of partitions of n into 'number of partitions of n into partition numbers' numbers" numbers} numbers.at n=48A130900
- a(n) = lcm((d1 + 1), (d2 + 1), ..., (dk + 1)), where d1, d2, ..., dk are the prime factors of the n-th Fermat pseudoprime to base 2, A001567(n).at n=37A216404
- Denominators of 1/16 - 1/(4 + 8*n)^2.at n=38A222740
- Records in A224796.at n=23A224719
- Numbers with 9 odd divisors.at n=40A267892
- Numbers coprime to the number of their even divisors.at n=52A269818
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 65", based on the 5-celled von Neumann neighborhood.at n=26A270085
- Numbers k such that k and the sum of the divisors of k have the same prime signature.at n=44A300572
- Heinz numbers of integer partitions such that the difference between the length of the minimal square containing and the maximal square contained in the Young diagram is 1.at n=33A325179
- Triples (a,b,c) such that (a+b+c)^3 = concat(a,b,c), a, b, c > 0, ordered by size of this value.at n=37A328199
- Numbers k such that k + sum of digits of k is a proper prime power.at n=51A342773
- a(n) is the smallest number such that there are precisely n squares between a(n) and 2*a(n) inclusive.at n=45A346522