12990388 has 12 divisors (see below), whose sum is σ = 22861440. Its totient is φ = 6458552.

The previous prime is 12990371. The next prime is 12990403. The reversal of 12990388 is 88309921.

It is a self number, because there is not a number n which added to its sum of digits gives 12990388.

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 3 ways as a sum of consecutive naturals, for example, 8356 + ... + 9787.

It is an arithmetic number, because the mean of its divisors is an integer number (1905120).

Almost surely, 2^12990388 is an apocalyptic number.

It is an amenable number.

12990388 is a deficient number, since it is larger than the sum of its proper divisors (9871052).

12990388 is a wasteful number, since it uses less digits than its factorization.

12990388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18326 (or 18324 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 12990388 is about 3604.2180844117. The cubic root of 12990388 is about 235.0755031270.

The spelling of 12990388 in words is "twelve million, nine hundred ninety thousand, three hundred eighty-eight".