12438921 has 12 divisors (see below), whose sum is σ = 18230576. Its totient is φ = 7538520.

The previous prime is 12438887. The next prime is 12438931. The reversal of 12438921 is 12983421.

It is not a de Polignac number, because 12438921 - 2¹¹ = 12436873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12438931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16771 + ... + 17496.

Almost surely, 2^12438921 is an apocalyptic number.

12438921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12438921 is a deficient number, since it is larger than the sum of its proper divisors (5791655).

12438921 is a wasteful number, since it uses less digits than its factorization.

12438921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34292 (or 34281 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 12438921 is about 3526.8854532009. The cubic root of 12438921 is about 231.7008195139.

The spelling of 12438921 in words is "twelve million, four hundred thirty-eight thousand, nine hundred twenty-one".