12289820 has 24 divisors (see below), whose sum is σ = 26931744. Its totient is φ = 4702016.

The previous prime is 12289819. The next prime is 12289847. The reversal of 12289820 is 2898221.

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, 12899 + ... + 13818.

It is an arithmetic number, because the mean of its divisors is an integer number (1122156).

Almost surely, 2^12289820 is an apocalyptic number.

12289820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12289820 is an abundant number, since it is smaller than the sum of its proper divisors (14641924).

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

12289820 is a wasteful number, since it uses less digits than its factorization.

12289820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26749 (or 26747 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 12289820 is about 3505.6839560919. The cubic root of 12289820 is about 230.7713234568.

The spelling of 12289820 in words is "twelve million, two hundred eighty-nine thousand, eight hundred twenty".