12809920 has 28 divisors (see below), whose sum is σ = 30504384. Its totient is φ = 5123840.

The previous prime is 12809879. The next prime is 12809921. The reversal of 12809920 is 2990821.

It is not an unprimeable number, because it can be changed into a prime (12809921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19696 + ... + 20335.

Almost surely, 2^12809920 is an apocalyptic number.

12809920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12809920 is an abundant number, since it is smaller than the sum of its proper divisors (17694464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12809920 is an equidigital number, since it uses as much as digits as its factorization.

12809920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40048 (or 40038 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 12809920 is about 3579.0948576421. The cubic root of 12809920 is about 233.9818331527.

The spelling of 12809920 in words is "twelve million, eight hundred nine thousand, nine hundred twenty".