13189987 has 4 divisors (see below), whose sum is σ = 13511736. Its totient is φ = 12868240.

The previous prime is 13189937. The next prime is 13189999. The reversal of 13189987 is 78998131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13189987 - 2¹¹ = 13187939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13189907) 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 3 ways as a sum of consecutive naturals, for example, 160813 + ... + 160894.

It is an arithmetic number, because the mean of its divisors is an integer number (3377934).

Almost surely, 2^13189987 is an apocalyptic number.

13189987 is a deficient number, since it is larger than the sum of its proper divisors (321749).

13189987 is an equidigital number, since it uses as much as digits as its factorization.

13189987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321748.

The product of its digits is 108864, while the sum is 46.

The square root of 13189987 is about 3631.8021697224. The cubic root of 13189987 is about 236.2733773047.

The spelling of 13189987 in words is "thirteen million, one hundred eighty-nine thousand, nine hundred eighty-seven".