386646666 has 32 divisors (see below), whose sum is σ = 884919168. Its totient is φ = 110326080.

The previous prime is 386646661. The next prime is 386646671. The reversal of 386646666 is 666646683.

It is an interprime number because it is at equal distance from previous prime (386646661) and next prime (386646671).

It is not an unprimeable number, because it can be changed into a prime (386646661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28876 + ... + 40088.

It is an arithmetic number, because the mean of its divisors is an integer number (27653724).

Almost surely, 2^386646666 is an apocalyptic number.

386646666 is an abundant number, since it is smaller than the sum of its proper divisors (498272502).

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

386646666 is a wasteful number, since it uses less digits than its factorization.

386646666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12046.

The product of its digits is 4478976, while the sum is 51.

The square root of 386646666 is about 19663.3330338475. Note that the first 3 decimals coincide. The cubic root of 386646666 is about 728.5143149934.

The spelling of 386646666 in words is "three hundred eighty-six million, six hundred forty-six thousand, six hundred sixty-six".