12378666 has 8 divisors (see below), whose sum is σ = 24757344. Its totient is φ = 4126220.

The previous prime is 12378649. The next prime is 12378673. The reversal of 12378666 is 66687321.

12378666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

12378666 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031550 + ... + 1031561.

It is an arithmetic number, because the mean of its divisors is an integer number (3094668).

Almost surely, 2^12378666 is an apocalyptic number.

12378666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12378666 is a wasteful number, since it uses less digits than its factorization.

12378666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063116.

The product of its digits is 72576, while the sum is 39.

The square root of 12378666 is about 3518.3328438339. The cubic root of 12378666 is about 231.3260888159.

The spelling of 12378666 in words is "twelve million, three hundred seventy-eight thousand, six hundred sixty-six".