12166538 has 4 divisors (see below), whose sum is σ = 18249810. Its totient is φ = 6083268.

The previous prime is 12166537. The next prime is 12166547. The reversal of 12166538 is 83566121.

It is a happy number.

12166538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6723649 + 5442889 = 2593^2 + 2333^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12166537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3041633 + ... + 3041636.

Almost surely, 2^12166538 is an apocalyptic number.

12166538 is a deficient number, since it is larger than the sum of its proper divisors (6083272).

12166538 is an equidigital number, since it uses as much as digits as its factorization.

12166538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6083271.

The product of its digits is 8640, while the sum is 32.

The square root of 12166538 is about 3488.0564789005. The cubic root of 12166538 is about 229.9970888100.

The spelling of 12166538 in words is "twelve million, one hundred sixty-six thousand, five hundred thirty-eight".