186
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 384
- Proper Divisor Sum (Aliquot Sum)
- 198
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- yes
Derived Values
- Euler's Totient
- 60
- Möbius Function
- -1
- Radical
- 186
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 18
- Smith 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
Names
- German
- einshundertsechsundachtzig· ordinal: einshundertsechsundachtzigste
- English
- one hundred eighty-six· ordinal: one hundred eighty-sixth
- Spanish
- ciento ochenta y seis· ordinal: 186º
- French
- cent quatre-vingt-six· ordinal: cent quatre-vingt-sixième
- Italian
- centoottantasei· ordinal: 186º
- Latin
- centum octoginta sex· ordinal: 186.
- Portuguese
- cento e oitenta e seis· ordinal: 186º
Appears in sequences
- Denumerants: Expansion of 1/((1-x)*(1-x^2)*(1-x^5)).at n=57A000115
- Series-parallel numbers.at n=5A000137
- Number of partitions into non-integral powers.at n=6A000160
- 3rd power of rooted tree enumerator; number of linear forests of 3 rooted trees.at n=5A000242
- Number of partitions into non-integral powers.at n=4A000345
- Powers of rooted tree enumerator.at n=2A000529
- Number of partitions of n, with three kinds of 1 and 2 and two kinds of 3,4,5,....at n=6A000714
- Total number of 1's in binary expansions of 0, ..., n.at n=62A000788
- a(n) = floor(2^n / n).at n=10A000799
- Fine's sequence (or Fine numbers): number of relations of valence >= 1 on an n-set; also number of ordered rooted trees with n nodes having root of even degree.at n=8A000957
- n! never ends in this many 0's.at n=36A000966
- Numbers that are divisible by at least three different primes.at n=27A000977
- Number of degree-n irreducible polynomials over GF(2); number of n-bead necklaces with beads of 2 colors when turning over is not allowed and with primitive period n; number of binary Lyndon words of length n.at n=11A001037
- Numbers that are the sum of 2 successive primes.at n=23A001043
- Continued fraction for e^2.at n=75A001204
- Number of fixed hexagonal polyominoes with n cells.at n=4A001207
- a(n) is the solution to the postage stamp problem with n denominations and 3 stamps.at n=10A001213
- Smallest k such that the product of q/(q-1) over the primes from prime(n) to prime(n+k-1) is greater than 2.at n=10A001276
- Number of ways of making change for n cents using coins of 1, 2, 5, 10, 25 cents.at n=38A001301
- Number of ways of making change for n cents using coins of 1, 2, 5, 10, 25, 50 cents.at n=38A001302