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BaseRepresentation
bin10100000111
31202200
4110013
520122
65543
73516
oct2407
91680
101287
11a70
128b3
13780
1467d
155ac
hex507

1287 has 12 divisors (see below), whose sum is σ = 2184. Its totient is φ = 720.

The previous prime is 1283. The next prime is 1289. The reversal of 1287 is 7821.

It can be divided in two parts, 12 and 87, that added together give a palindrome (99).

1287 = 33 + 43 + ... + 83.

1287 is a nontrivial binomial coefficient, being equal to C(13, 5).

It is not a de Polignac number, because 1287 - 22 = 1283 is a prime.

It is a plaindrome in base 14 and base 15.

It is a nialpdrome in base 6 and base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1283) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 93 + ... + 105.

It is an arithmetic number, because the mean of its divisors is an integer number (182).

1287 is a deficient number, since it is larger than the sum of its proper divisors (897).

1287 is a wasteful number, since it uses less digits than its factorization.

1287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30 (or 27 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 1287 is about 35.8747822293. The cubic root of 1287 is about 10.8774271237.

The spelling of 1287 in words is "one thousand, two hundred eighty-seven".

Divisors: 1 3 9 11 13 33 39 99 117 143 429 1287