12188890 has 64 divisors (see below), whose sum is σ = 26707968. Its totient is φ = 3916800.

The previous prime is 12188863. The next prime is 12188927. The reversal of 12188890 is 9888121.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88902 + ... + 89038.

It is an arithmetic number, because the mean of its divisors is an integer number (417312).

Almost surely, 2^12188890 is an apocalyptic number.

12188890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12188890 is an abundant number, since it is smaller than the sum of its proper divisors (14519078).

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

12188890 is a wasteful number, since it uses less digits than its factorization.

12188890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 12188890 is about 3491.2590852012. The cubic root of 12188890 is about 230.1378505700.

The spelling of 12188890 in words is "twelve million, one hundred eighty-eight thousand, eight hundred ninety".