393666394 has 16 divisors (see below), whose sum is σ = 645278400. Its totient is φ = 178634560.

The previous prime is 393666373. The next prime is 393666439. The reversal of 393666394 is 493666393.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1759 + ... + 28114.

It is an arithmetic number, because the mean of its divisors is an integer number (40329900).

Almost surely, 2^393666394 is an apocalyptic number.

393666394 is a deficient number, since it is larger than the sum of its proper divisors (251612006).

393666394 is a wasteful number, since it uses less digits than its factorization.

393666394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30485.

The product of its digits is 1889568, while the sum is 49.

The square root of 393666394 is about 19841.0280479616. The cubic root of 393666394 is about 732.8967244487.

Subtracting 393666394 from its reverse (493666393), we obtain a palindrome (99999999).

The spelling of 393666394 in words is "three hundred ninety-three million, six hundred sixty-six thousand, three hundred ninety-four".