393961018 has 16 divisors (see below), whose sum is σ = 645331680. Its totient is φ = 178887600.

The previous prime is 393960977. The next prime is 393961019. The reversal of 393961018 is 810169393.

It is not an unprimeable number, because it can be changed into a prime (393961019) 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, 13693 + ... + 31231.

It is an arithmetic number, because the mean of its divisors is an integer number (40333230).

Almost surely, 2^393961018 is an apocalyptic number.

393961018 is a deficient number, since it is larger than the sum of its proper divisors (251370662).

393961018 is a wasteful number, since it uses less digits than its factorization.

393961018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18573.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 393961018 is about 19848.4512745957. The cubic root of 393961018 is about 733.0795146846.

The spelling of 393961018 in words is "three hundred ninety-three million, nine hundred sixty-one thousand, eighteen".