13287987 has 12 divisors (see below), whose sum is σ = 19247280. Its totient is φ = 8833968.

The previous prime is 13287949. The next prime is 13287991. The reversal of 13287987 is 78978231.

It is not a de Polignac number, because 13287987 - 2¹² = 13283891 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (13287917) 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 11 ways as a sum of consecutive naturals, for example, 1714 + ... + 5432.

It is an arithmetic number, because the mean of its divisors is an integer number (1603940).

Almost surely, 2^13287987 is an apocalyptic number.

13287987 is a deficient number, since it is larger than the sum of its proper divisors (5959293).

13287987 is a wasteful number, since it uses less digits than its factorization.

13287987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4122 (or 4119 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 13287987 is about 3645.2691258671. The cubic root of 13287987 is about 236.8570948564.

The spelling of 13287987 in words is "thirteen million, two hundred eighty-seven thousand, nine hundred eighty-seven".