12188990 has 32 divisors (see below), whose sum is σ = 24766560. Its totient is φ = 4278400.

The previous prime is 12188951. The next prime is 12188999. The reversal of 12188990 is 9988121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12188999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1280 + ... + 5100.

It is an arithmetic number, because the mean of its divisors is an integer number (773955).

Almost surely, 2^12188990 is an apocalyptic number.

12188990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12188990 is an abundant number, since it is smaller than the sum of its proper divisors (12577570).

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

12188990 is a wasteful number, since it uses less digits than its factorization.

12188990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3868.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 12188990 is about 3491.2734066526. The cubic root of 12188990 is about 230.1384799334.

The spelling of 12188990 in words is "twelve million, one hundred eighty-eight thousand, nine hundred ninety".