12821656 has 32 divisors (see below), whose sum is σ = 25704000. Its totient is φ = 5978016.

The previous prime is 12821629. The next prime is 12821659. The reversal of 12821656 is 65612821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12821659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9555 + ... + 10813.

It is an arithmetic number, because the mean of its divisors is an integer number (803250).

Almost surely, 2^12821656 is an apocalyptic number.

It is an amenable number.

12821656 is an abundant number, since it is smaller than the sum of its proper divisors (12882344).

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

12821656 is a wasteful number, since it uses less digits than its factorization.

12821656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351 (or 1347 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 12821656 is about 3580.7340029664. The cubic root of 12821656 is about 234.0532666620.

The spelling of 12821656 in words is "twelve million, eight hundred twenty-one thousand, six hundred fifty-six".