12987689 has 8 divisors (see below), whose sum is σ = 15258432. Its totient is φ = 10898640.

The previous prime is 12987647. The next prime is 12987707. The reversal of 12987689 is 98678921.

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

It is a cyclic number.

It is not a de Polignac number, because 12987689 - 2¹⁶ = 12922153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12987889) 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 7 ways as a sum of consecutive naturals, for example, 45269 + ... + 45554.

It is an arithmetic number, because the mean of its divisors is an integer number (1907304).

Almost surely, 2^12987689 is an apocalyptic number.

It is an amenable number.

12987689 is a deficient number, since it is larger than the sum of its proper divisors (2270743).

12987689 is a wasteful number, since it uses less digits than its factorization.

12987689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90847.

The product of its digits is 435456, while the sum is 50.

The square root of 12987689 is about 3603.8436425572. The cubic root of 12987689 is about 235.0592215315.

The spelling of 12987689 in words is "twelve million, nine hundred eighty-seven thousand, six hundred eighty-nine".