12189090 has 32 divisors (see below), whose sum is σ = 29362176. Its totient is φ = 3238400.

The previous prime is 12189071. The next prime is 12189097. The reversal of 12189090 is 9098121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12189097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10015 + ... + 11165.

It is an arithmetic number, because the mean of its divisors is an integer number (917568).

Almost surely, 2^12189090 is an apocalyptic number.

12189090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12189090 is an abundant number, since it is smaller than the sum of its proper divisors (17173086).

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

12189090 is a wasteful number, since it uses less digits than its factorization.

12189090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 12189090 is about 3491.2877280453. The cubic root of 12189090 is about 230.1391092933.

The spelling of 12189090 in words is "twelve million, one hundred eighty-nine thousand, ninety".