12538666 has 16 divisors (see below), whose sum is σ = 21594240. Its totient is φ = 5348880.

The previous prime is 12538649. The next prime is 12538679. The reversal of 12538666 is 66683521.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1251 + ... + 5161.

It is an arithmetic number, because the mean of its divisors is an integer number (1349640).

Almost surely, 2^12538666 is an apocalyptic number.

12538666 is a deficient number, since it is larger than the sum of its proper divisors (9055574).

12538666 is a wasteful number, since it uses less digits than its factorization.

12538666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4149.

The product of its digits is 51840, while the sum is 37.

The square root of 12538666 is about 3540.9978819536. The cubic root of 12538666 is about 232.3184909328.

The spelling of 12538666 in words is "twelve million, five hundred thirty-eight thousand, six hundred sixty-six".