12987589 has 4 divisors (see below), whose sum is σ = 13036140. Its totient is φ = 12939040.

The previous prime is 12987587. The next prime is 12987593. The reversal of 12987589 is 98578921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98578921 = 7 ⋅14082703.

It can be written as a sum of positive squares in 2 ways, for example, as 2856100 + 10131489 = 1690^2 + 3183^2 .

It is a cyclic number.

It is not a de Polignac number, because 12987589 - 2¹ = 12987587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12987581) 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, 23872 + ... + 24409.

It is an arithmetic number, because the mean of its divisors is an integer number (3259035).

Almost surely, 2^12987589 is an apocalyptic number.

It is an amenable number.

12987589 is a deficient number, since it is larger than the sum of its proper divisors (48551).

12987589 is an equidigital number, since it uses as much as digits as its factorization.

12987589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48550.

The product of its digits is 362880, while the sum is 49.

The square root of 12987589 is about 3603.8297684547. The cubic root of 12987589 is about 235.0586182426.

The spelling of 12987589 in words is "twelve million, nine hundred eighty-seven thousand, five hundred eighty-nine".