394103866 has 16 divisors (see below), whose sum is σ = 648643464. Its totient is φ = 178461504.

The previous prime is 394103863. The next prime is 394103867. The reversal of 394103866 is 668301493.

It can be written as a sum of positive squares in 4 ways, for example, as 386948241 + 7155625 = 19671^2 + 2675^2 .

It is a super-2 number, since 2×394103866² = 310635714392291912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (394103863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141621 + ... + 144376.

Almost surely, 2^394103866 is an apocalyptic number.

394103866 is a deficient number, since it is larger than the sum of its proper divisors (254539598).

394103866 is a wasteful number, since it uses less digits than its factorization.

394103866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286065.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 394103866 is about 19852.0494156145. The cubic root of 394103866 is about 733.1681074501.

The spelling of 394103866 in words is "three hundred ninety-four million, one hundred three thousand, eight hundred sixty-six".