12987289 has 4 divisors (see below), whose sum is σ = 14842624. Its totient is φ = 11131956.

The previous prime is 12987253. The next prime is 12987307. The reversal of 12987289 is 98278921.

12987289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12987289 - 2¹⁹ = 12463001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12987229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927657 + ... + 927670.

It is an arithmetic number, because the mean of its divisors is an integer number (3710656).

Almost surely, 2^12987289 is an apocalyptic number.

It is an amenable number.

12987289 is a deficient number, since it is larger than the sum of its proper divisors (1855335).

12987289 is an equidigital number, since it uses as much as digits as its factorization.

12987289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855334.

The product of its digits is 145152, while the sum is 46.

The square root of 12987289 is about 3603.7881458266. The cubic root of 12987289 is about 235.0568083576.

The spelling of 12987289 in words is "twelve million, nine hundred eighty-seven thousand, two hundred eighty-nine".