394012666 has 16 divisors (see below), whose sum is σ = 610587648. Its totient is φ = 190494000.

The previous prime is 394012657. The next prime is 394012669. The reversal of 394012666 is 666210493.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (394012669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116191 + ... + 119533.

It is an arithmetic number, because the mean of its divisors is an integer number (38161728).

Almost surely, 2^394012666 is an apocalyptic number.

394012666 is a deficient number, since it is larger than the sum of its proper divisors (216574982).

394012666 is a wasteful number, since it uses less digits than its factorization.

394012666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 394012666 is about 19849.7522906458. The cubic root of 394012666 is about 733.1115486800. Note that the first 3 decimals are identical.

The spelling of 394012666 in words is "three hundred ninety-four million, twelve thousand, six hundred sixty-six".