12821538 has 32 divisors (see below), whose sum is σ = 27394560. Its totient is φ = 3991680.

The previous prime is 12821533. The next prime is 12821551. The reversal of 12821538 is 83512821.

It is not an unprimeable number, because it can be changed into a prime (12821531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4206 + ... + 6582.

It is an arithmetic number, because the mean of its divisors is an integer number (856080).

Almost surely, 2^12821538 is an apocalyptic number.

12821538 is an abundant number, since it is smaller than the sum of its proper divisors (14573022).

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

12821538 is a wasteful number, since it uses less digits than its factorization.

12821538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442.

The product of its digits is 3840, while the sum is 30.

The square root of 12821538 is about 3580.7175258599. The cubic root of 12821538 is about 234.0525486484.

The spelling of 12821538 in words is "twelve million, eight hundred twenty-one thousand, five hundred thirty-eight".