2386
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
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3582
- Proper Divisor Sum (Aliquot Sum)
- 1196
- 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
- 1192
- Möbius Function
- 1
- Radical
- 2386
- 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
- 102
- 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
- yes
- Odd
- no
Appears in sequences
- Number of partitions of n into Fibonacci parts (with a single type of 1).at n=45A003107
- Number of non-Abelian metacyclic groups of order p^n (p odd).at n=51A007983
- s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A000201 (lower Wythoff sequence), t = A001950 (upper Wythoff sequence).at n=17A025119
- Number of linearly ordered Abelian monoids of size n (semigroups with greatest element of the corresponding chain as neutral element); triangular norms on an n-chain.at n=7A030453
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 48.at n=8A031546
- "STIRLING" transform of squares A000290.at n=6A033452
- Coordination sequence T2 for Zeolite Code CFI.at n=32A033600
- Coordination sequence T3 for Zeolite Code SBT.at n=39A033614
- Decimal part of a(n)^(1/2) starts with reversal of its integer part: first term of runs.at n=32A034308
- Number of partitions of n into parts not of the form 21k, 21k+5 or 21k-5. Also number of partitions with at most 4 parts of size 1 and differences between parts at distance 9 are greater than 1.at n=27A035983
- Numbers whose base-7 representation contains exactly three 6's.at n=16A043419
- Numbers whose base-2 representation has exactly 10 runs.at n=14A043577
- a(n) = (s(n)-1)/2, where s(n) is the n-th number whose base-2 representation has exactly 11 runs.at n=15A043691
- Numbers n such that number of runs in the base 2 representation of n is congruent to 1 mod 9.at n=25A043755
- Numbers n such that number of runs in the base 2 representation of n is congruent to 0 mod 10.at n=14A043763
- Numbers n such that string 2,2 occurs in the base 8 representation of n but not of n-1.at n=37A044205
- Numbers n such that string 4,1 occurs in the base 9 representation of n but not of n-1.at n=32A044288
- Numbers n such that string 8,6 occurs in the base 10 representation of n but not of n-1.at n=25A044418
- Numbers n such that string 2,2 occurs in the base 8 representation of n but not of n+1.at n=37A044586
- Numbers n such that string 4,1 occurs in the base 9 representation of n but not of n+1.at n=32A044669