187
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 216
- Proper Divisor Sum (Aliquot Sum)
- 29
- 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
- 160
- Möbius Function
- 1
- Radical
- 187
- 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
- 44
- Smith 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
- no
- Odd
- yes
Names
- German
- einshundertsiebenundachtzig· ordinal: einshundertsiebenundachtzigste
- English
- one hundred eighty-seven· ordinal: one hundred eighty-seventh
- Spanish
- ciento ochenta y siete· ordinal: 187º
- French
- cent quatre-vingt-sept· ordinal: cent quatre-vingt-septième
- Italian
- centoottantasette· ordinal: 187º
- Latin
- centum octoginta septem· ordinal: 187.
- Portuguese
- cento e oitenta e sete· ordinal: 187º
Appears in sequences
- Numbers k such that (2k)^4 + 1 is prime.at n=50A000059
- Partial sums of (unordered) ways of making change for n cents using coins of 1, 2, 5, 10 cents.at n=17A000064
- Number of trees of diameter 5.at n=12A000147
- From area of cyclic polygon of 2n + 1 sides.at n=3A000531
- Triangle read by rows, in which row n consists of n(n+m) for m = 1 .. n-1.at n=50A001283
- Numbers of form m*k with m+1 <= k <= 2m-1.at n=51A001284
- Expansion of 1/((1-x)^2*(1-x^2)*(1-x^5)).at n=18A001304
- Expansion of 1/((1-x)^2*(1-x^2)*(1-x^5)*(1-x^10)*(1-x^20)).at n=17A001305
- Number of ways of making change for n cents using coins of 1, 2, 4, 10, 20, 40, 100 cents.at n=35A001310
- Number of ways of making change for n cents using coins of 1, 2, 4, 10, 20, 40, 100 cents.at n=34A001310
- Generalized pentagonal numbers: m*(3*m - 1)/2, m = 0, +-1, +-2, +-3, ....at n=22A001318
- Semiprimes (or biprimes): products of two primes.at n=60A001358
- Number of ways of making change for n cents using coins of 1, 2, 4, 10 cents.at n=37A001362
- Number of ways of making change for n cents using coins of 1, 2, 4, 10 cents.at n=36A001362
- Partial sums of A001462; also a(n) is the last occurrence of n in A001462.at n=29A001463
- Nearest integer to 2*n*log(n).at n=28A001618
- Expansion of g.f. x/((1 - x)^2*(1 - x^3)).at n=32A001840
- A Beatty sequence: a(n) = floor(n*(2 + sqrt(2))).at n=54A001952
- a(n) = floor((n+2/3)*(5+sqrt(13))/2); v-pile positions in the 3-Wythoff game.at n=43A001960
- v-pile positions of the 4-Wythoff game with i=3.at n=35A001968