12821660 has 12 divisors (see below), whose sum is σ = 26925528. Its totient is φ = 5128656.

The previous prime is 12821659. The next prime is 12821663. The reversal of 12821660 is 6612821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12821663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320522 + ... + 320561.

It is an arithmetic number, because the mean of its divisors is an integer number (2243794).

Almost surely, 2^12821660 is an apocalyptic number.

12821660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12821660 is an abundant number, since it is smaller than the sum of its proper divisors (14103868).

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

12821660 is a wasteful number, since it uses less digits than its factorization.

12821660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641092 (or 641090 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 12821660 is about 3580.7345615111. The cubic root of 12821660 is about 234.0532910014.

The spelling of 12821660 in words is "twelve million, eight hundred twenty-one thousand, six hundred sixty".