12809520 has 60 divisors (see below), whose sum is σ = 43021056. Its totient is φ = 3415680.

The previous prime is 12809513. The next prime is 12809539. The reversal of 12809520 is 2590821.

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8176 + ... + 9615.

Almost surely, 2^12809520 is an apocalyptic number.

12809520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12809520 is an abundant number, since it is smaller than the sum of its proper divisors (30211536).

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

12809520 is a wasteful number, since it uses less digits than its factorization.

12809520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17810 (or 17801 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 12809520 is about 3579.0389771557. The cubic root of 12809520 is about 233.9793977040.

The spelling of 12809520 in words is "twelve million, eight hundred nine thousand, five hundred twenty".