12429909 has 16 divisors (see below), whose sum is σ = 18719040. Its totient is φ = 8149680.

The previous prime is 12429889. The next prime is 12429947. The reversal of 12429909 is 90992421.

It is not a de Polignac number, because 12429909 - 2⁸ = 12429653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12429409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2127 + ... + 5420.

It is an arithmetic number, because the mean of its divisors is an integer number (1169940).

Almost surely, 2^12429909 is an apocalyptic number.

It is an amenable number.

12429909 is a deficient number, since it is larger than the sum of its proper divisors (6289131).

12429909 is an equidigital number, since it uses as much as digits as its factorization.

12429909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7617 (or 7611 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 12429909 is about 3525.6076072076. The cubic root of 12429909 is about 231.6448502364.

It can be divided in two parts, 1 and 2429909, that added together give a triangular number (2429910 = T₂₂₀₄).

The spelling of 12429909 in words is "twelve million, four hundred twenty-nine thousand, nine hundred nine".