12509443 has 4 divisors (see below), whose sum is σ = 12517168. Its totient is φ = 12501720.

The previous prime is 12509437. The next prime is 12509479. The reversal of 12509443 is 34490521.

12509443 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 brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12509443 - 2⁹ = 12508931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12509423) 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, 396 + ... + 5017.

It is an arithmetic number, because the mean of its divisors is an integer number (3129292).

Almost surely, 2^12509443 is an apocalyptic number.

12509443 is a deficient number, since it is larger than the sum of its proper divisors (7725).

12509443 is an equidigital number, since it uses as much as digits as its factorization.

12509443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7724.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 12509443 is about 3536.8690956834. The cubic root of 12509443 is about 232.1378676685.

Adding to 12509443 its reverse (34490521), we get a palindrome (46999964).

The spelling of 12509443 in words is "twelve million, five hundred nine thousand, four hundred forty-three".