12987443 has 4 divisors (see below), whose sum is σ = 14842800. Its totient is φ = 11132088.

The previous prime is 12987437. The next prime is 12987461. The reversal of 12987443 is 34478921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34478921 = 1933 ⋅17837.

It is a cyclic number.

It is not a de Polignac number, because 12987443 - 2⁶ = 12987379 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12987397 and 12987406.

It is not an unprimeable number, because it can be changed into a prime (12987413) 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, 927668 + ... + 927681.

It is an arithmetic number, because the mean of its divisors is an integer number (3710700).

Almost surely, 2^12987443 is an apocalyptic number.

12987443 is a deficient number, since it is larger than the sum of its proper divisors (1855357).

12987443 is an equidigital number, since it uses as much as digits as its factorization.

12987443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855356.

The product of its digits is 48384, while the sum is 38.

The square root of 12987443 is about 3603.8095121690. The cubic root of 12987443 is about 235.0577374354.

The spelling of 12987443 in words is "twelve million, nine hundred eighty-seven thousand, four hundred forty-three".