12403909 has 24 divisors (see below), whose sum is σ = 15329600. Its totient is φ = 10026576.

The previous prime is 12403901. The next prime is 12403921. The reversal of 12403909 is 90930421.

It is a happy number.

12403909 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12403909 - 2³ = 12403901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12403901) 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, 288442 + ... + 288484.

Almost surely, 2^12403909 is an apocalyptic number.

It is an amenable number.

12403909 is a deficient number, since it is larger than the sum of its proper divisors (2925691).

12403909 is an frugal number, since it uses more digits than its factorization.

12403909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 12403909 is about 3521.9183692982. The cubic root of 12403909 is about 231.4832247484.

The spelling of 12403909 in words is "twelve million, four hundred three thousand, nine hundred nine".