12821860 has 12 divisors (see below), whose sum is σ = 26925948. Its totient is φ = 5128736.

The previous prime is 12821843. The next prime is 12821891. The reversal of 12821860 is 6812821.

It can be written as a sum of positive squares in 2 ways, for example, as 1679616 + 11142244 = 1296^2 + 3338^2 .

It is an unprimeable number.

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, 320527 + ... + 320566.

It is an arithmetic number, because the mean of its divisors is an integer number (2243829).

Almost surely, 2^12821860 is an apocalyptic number.

12821860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12821860 is an abundant number, since it is smaller than the sum of its proper divisors (14104088).

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

12821860 is a wasteful number, since it uses less digits than its factorization.

12821860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641102 (or 641100 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 12821860 is about 3580.7624886328. The cubic root of 12821860 is about 234.0545079633.

The spelling of 12821860 in words is "twelve million, eight hundred twenty-one thousand, eight hundred sixty".