12987243 has 8 divisors (see below), whose sum is σ = 19240400. Its totient is φ = 8658144.

The previous prime is 12987229. The next prime is 12987253. The reversal of 12987243 is 34278921.

It is not a de Polignac number, because 12987243 - 2⁶ = 12987179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12987198 and 12987207.

It is not an unprimeable number, because it can be changed into a prime (12987253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240478 + ... + 240531.

It is an arithmetic number, because the mean of its divisors is an integer number (2405050).

Almost surely, 2^12987243 is an apocalyptic number.

12987243 is a deficient number, since it is larger than the sum of its proper divisors (6253157).

12987243 is an equidigital number, since it uses as much as digits as its factorization.

12987243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481018 (or 481012 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 12987243 is about 3603.7817636477. The cubic root of 12987243 is about 235.0565308394.

The spelling of 12987243 in words is "twelve million, nine hundred eighty-seven thousand, two hundred forty-three".