12443391 has 24 divisors (see below), whose sum is σ = 19169280. Its totient is φ = 7760016.

The previous prime is 12443363. The next prime is 12443399. The reversal of 12443391 is 19334421.

It is not a de Polignac number, because 12443391 - 2²¹ = 10346239 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12443399) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9090 + ... + 10368.

It is an arithmetic number, because the mean of its divisors is an integer number (798720).

Almost surely, 2^12443391 is an apocalyptic number.

12443391 is a deficient number, since it is larger than the sum of its proper divisors (6725889).

12443391 is a wasteful number, since it uses less digits than its factorization.

12443391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355 (or 1352 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 12443391 is about 3527.5190998774. The cubic root of 12443391 is about 231.7285705443.

The spelling of 12443391 in words is "twelve million, four hundred forty-three thousand, three hundred ninety-one".