12538520 has 32 divisors (see below), whose sum is σ = 29872800. Its totient is φ = 4720128.

The previous prime is 12538517. The next prime is 12538541. The reversal of 12538520 is 2583521.

It is a self number, because there is not a number n which added to its sum of digits gives 12538520.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8540 + ... + 9899.

It is an arithmetic number, because the mean of its divisors is an integer number (933525).

Almost surely, 2^12538520 is an apocalyptic number.

12538520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12538520 is an abundant number, since it is smaller than the sum of its proper divisors (17334280).

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

12538520 is a wasteful number, since it uses less digits than its factorization.

12538520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18467 (or 18463 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 12538520 is about 3540.9772662360. The cubic root of 12538520 is about 232.3175892252.

The spelling of 12538520 in words is "twelve million, five hundred thirty-eight thousand, five hundred twenty".