12438643 has 8 divisors (see below), whose sum is σ = 14349312. Its totient is φ = 10561416.

The previous prime is 12438637. The next prime is 12438659. The reversal of 12438643 is 34683421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12438643 is a prime.

It is a super-3 number, since 3×12438643³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12438683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7555 + ... + 9052.

It is an arithmetic number, because the mean of its divisors is an integer number (1793664).

Almost surely, 2^12438643 is an apocalyptic number.

12438643 is a deficient number, since it is larger than the sum of its proper divisors (1910669).

12438643 is a wasteful number, since it uses less digits than its factorization.

12438643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16721.

The product of its digits is 13824, while the sum is 31.

The square root of 12438643 is about 3526.8460414370. The cubic root of 12438643 is about 231.6990933913.

The spelling of 12438643 in words is "twelve million, four hundred thirty-eight thousand, six hundred forty-three".