12821990 has 16 divisors (see below), whose sum is σ = 23182848. Its totient is φ = 5105856.

The previous prime is 12821989. The next prime is 12822001. The reversal of 12821990 is 9912821.

It is a happy number.

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, 422 + ... + 5081.

It is an arithmetic number, because the mean of its divisors is an integer number (1448928).

Almost surely, 2^12821990 is an apocalyptic number.

12821990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12821990 is a deficient number, since it is larger than the sum of its proper divisors (10360858).

12821990 is a wasteful number, since it uses less digits than its factorization.

12821990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5743.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12821990 is about 3580.7806411452. The cubic root of 12821990 is about 234.0552989817.

The spelling of 12821990 in words is "twelve million, eight hundred twenty-one thousand, nine hundred ninety".