393987814 has 16 divisors (see below), whose sum is σ = 645096960. Its totient is φ = 178977160.

The previous prime is 393987791. The next prime is 393987817. The reversal of 393987814 is 418789393.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393987817) 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, 40467 + ... + 49249.

It is an arithmetic number, because the mean of its divisors is an integer number (40318560).

Almost surely, 2^393987814 is an apocalyptic number.

393987814 is a deficient number, since it is larger than the sum of its proper divisors (251109146).

393987814 is a wasteful number, since it uses less digits than its factorization.

393987814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10835.

The product of its digits is 1306368, while the sum is 52.

The square root of 393987814 is about 19849.1262780002. The cubic root of 393987814 is about 733.0961349020.

The spelling of 393987814 in words is "three hundred ninety-three million, nine hundred eighty-seven thousand, eight hundred fourteen".