1287563 has 16 divisors (see below), whose sum is σ = 1477440. Its totient is φ = 1115136.

The previous prime is 1287553. The next prime is 1287569. The reversal of 1287563 is 3657821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1287563 - 2⁶ = 1287499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14423 + ... + 14511.

It is an arithmetic number, because the mean of its divisors is an integer number (92340).

2^1287563 is an apocalyptic number.

1287563 is a deficient number, since it is larger than the sum of its proper divisors (189877).

1287563 is a wasteful number, since it uses less digits than its factorization.

1287563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166.

The product of its digits is 10080, while the sum is 32.

The square root of 1287563 is about 1134.7083325683. The cubic root of 1287563 is about 108.7901300789.

The spelling of 1287563 in words is "one million, two hundred eighty-seven thousand, five hundred sixty-three".