12087990 has 48 divisors (see below), whose sum is σ = 33087600. Its totient is φ = 3053376.

The previous prime is 12087947. The next prime is 12088001. The reversal of 12087990 is 9978021.

It is a happy number.

It is a super-2 number, since 2×12087990² = 292239004480200, which contains 22 as substring.

It is a Curzon 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 23 ways as a sum of consecutive naturals, for example, 1825 + ... + 5244.

It is an arithmetic number, because the mean of its divisors is an integer number (689325).

Almost surely, 2^12087990 is an apocalyptic number.

12087990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12087990 is an abundant number, since it is smaller than the sum of its proper divisors (20999610).

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

12087990 is a wasteful number, since it uses less digits than its factorization.

12087990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7101 (or 7098 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 12087990 is about 3476.7786814809. The cubic root of 12087990 is about 229.5010608406.

The spelling of 12087990 in words is "twelve million, eighty-seven thousand, nine hundred ninety".