12509429 has 4 divisors (see below), whose sum is σ = 13167840. Its totient is φ = 11851020.

The previous prime is 12509423. The next prime is 12509437. The reversal of 12509429 is 92490521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12509429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12509395 and 12509404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12509423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329177 + ... + 329214.

It is an arithmetic number, because the mean of its divisors is an integer number (3291960).

Almost surely, 2^12509429 is an apocalyptic number.

12509429 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12509429 is a deficient number, since it is larger than the sum of its proper divisors (658411).

12509429 is an equidigital number, since it uses as much as digits as its factorization.

12509429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658410.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 12509429 is about 3536.8671165312. The cubic root of 12509429 is about 232.1377810691.

The spelling of 12509429 in words is "twelve million, five hundred nine thousand, four hundred twenty-nine".