393993385 has 8 divisors (see below), whose sum is σ = 472989960. Its totient is φ = 315062784.

The previous prime is 393993359. The next prime is 393993403. The reversal of 393993385 is 583399393.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 82682649 + 311310736 = 9093^2 + 17644^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 393993385 - 2²³ = 385604777 is a prime.

It is an unprimeable number.

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, 2230 + ... + 28159.

It is an arithmetic number, because the mean of its divisors is an integer number (59123745).

Almost surely, 2^393993385 is an apocalyptic number.

It is an amenable number.

393993385 is a deficient number, since it is larger than the sum of its proper divisors (78996575).

393993385 is a wasteful number, since it uses less digits than its factorization.

393993385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32987.

The product of its digits is 2361960, while the sum is 52.

The square root of 393993385 is about 19849.2666111370. The cubic root of 393993385 is about 733.0995902198.

The spelling of 393993385 in words is "three hundred ninety-three million, nine hundred ninety-three thousand, three hundred eighty-five".