12804520 has 16 divisors (see below), whose sum is σ = 28810260. Its totient is φ = 5121792.

The previous prime is 12804509. The next prime is 12804523. The reversal of 12804520 is 2540821.

It can be written as a sum of positive squares in 2 ways, for example, as 12236004 + 568516 = 3498^2 + 754^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12804491 and 12804500.

It is not an unprimeable number, because it can be changed into a prime (12804523) 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, 160017 + ... + 160096.

Almost surely, 2^12804520 is an apocalyptic number.

12804520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12804520 is an abundant number, since it is smaller than the sum of its proper divisors (16005740).

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

12804520 is a wasteful number, since it uses less digits than its factorization.

12804520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320124 (or 320120 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 12804520 is about 3578.3403974468. The cubic root of 12804520 is about 233.9489503170.

The spelling of 12804520 in words is "twelve million, eight hundred four thousand, five hundred twenty".