12809405 has 8 divisors (see below), whose sum is σ = 17567232. Its totient is φ = 8783568.

The previous prime is 12809359. The next prime is 12809491. The reversal of 12809405 is 50490821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12809405 - 2⁸ = 12809149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182957 + ... + 183026.

It is an arithmetic number, because the mean of its divisors is an integer number (2195904).

Almost surely, 2^12809405 is an apocalyptic number.

It is an amenable number.

12809405 is a deficient number, since it is larger than the sum of its proper divisors (4757827).

12809405 is an equidigital number, since it uses as much as digits as its factorization.

12809405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365995.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 12809405 is about 3579.0229113544. The cubic root of 12809405 is about 233.9786975031.

The spelling of 12809405 in words is "twelve million, eight hundred nine thousand, four hundred five".