Search a number
286 = 21113
BaseRepresentation
bin100011110
3101121
410132
52121
61154
7556
oct436
9347
10286
11240
121ba
13190
14166
15141
hex11e

286 has 8 divisors (see below), whose sum is σ = 504. Its totient is φ = 120.

The previous prime is 283. The next prime is 293. The reversal of 286 is 682.

Subtracting from 286 its product of digits (96), we obtain a triangular number (190 = T19).

It can be divided in two parts, 2 and 86, that added together give a palindrome (88).

286 = T1 + T2 + ... + T11.

286 is nontrivially palindromic in base 15.

286 is an esthetic number in base 5, because in such base its adjacent digits differ by 1.

286 is a nontrivial binomial coefficient, being equal to C(13, 3).

It is a sphenic number, since it is the product of 3 distinct primes.

286 is an undulating number in base 5 and base 15.

It is a plaindrome in base 7, base 9, base 14 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281) by changing a digit.

It is the 11-th tetrahedral number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16 + ... + 28.

It is an arithmetic number, because the mean of its divisors is an integer number (63).

2286 is an apocalyptic number.

286 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

286 is the 11-th heptagonal number.

286 is a deficient number, since it is larger than the sum of its proper divisors (218).

286 is a wasteful number, since it uses less digits than its factorization.

286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26.

The product of its digits is 96, while the sum is 16.

The square root of 286 is about 16.9115345253. The cubic root of 286 is about 6.5885322745.

The spelling of 286 in words is "two hundred eighty-six", and thus it is an aban number.

Divisors: 1 2 11 13 22 26 143 286