12166138 has 16 divisors (see below), whose sum is σ = 19284480. Its totient is φ = 5747056.

The previous prime is 12166073. The next prime is 12166139. The reversal of 12166138 is 83166121.

It is not an unprimeable number, because it can be changed into a prime (12166139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495 + ... + 4957.

It is an arithmetic number, because the mean of its divisors is an integer number (1205280).

Almost surely, 2^12166138 is an apocalyptic number.

12166138 is a deficient number, since it is larger than the sum of its proper divisors (7118342).

12166138 is a wasteful number, since it uses less digits than its factorization.

12166138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4541.

The product of its digits is 1728, while the sum is 28.

The square root of 12166138 is about 3487.9991399082. Note that the first 3 decimals coincide. The cubic root of 12166138 is about 229.9945682397.

The spelling of 12166138 in words is "twelve million, one hundred sixty-six thousand, one hundred thirty-eight".