12520809 has 24 divisors (see below), whose sum is σ = 21570432. Its totient is φ = 6842880.

The previous prime is 12520793. The next prime is 12520811. The reversal of 12520809 is 90802521.

12520809 = 160³ + 161³ + 162³.

It is not a de Polignac number, because 12520809 - 2⁴ = 12520793 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2872 + ... + 5769.

It is an arithmetic number, because the mean of its divisors is an integer number (898768).

Almost surely, 2^12520809 is an apocalyptic number.

It is an amenable number.

12520809 is a deficient number, since it is larger than the sum of its proper divisors (9049623).

12520809 is a wasteful number, since it uses less digits than its factorization.

12520809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8677 (or 8674 counting only the distinct ones).

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

The square root of 12520809 is about 3538.4755192031. The cubic root of 12520809 is about 232.2081527138.

The spelling of 12520809 in words is "twelve million, five hundred twenty thousand, eight hundred nine".