393932885 has 4 divisors (see below), whose sum is σ = 472719468. Its totient is φ = 315146304.

The previous prime is 393932843. The next prime is 393932989. The reversal of 393932885 is 588239393.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146845924 + 247086961 = 12118^2 + 15719^2 .

It is a cyclic number.

It is not a de Polignac number, because 393932885 - 2²⁸ = 125497429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 39393284 + ... + 39393293.

It is an arithmetic number, because the mean of its divisors is an integer number (118179867).

Almost surely, 2^393932885 is an apocalyptic number.

It is an amenable number.

393932885 is a deficient number, since it is larger than the sum of its proper divisors (78786583).

393932885 is an equidigital number, since it uses as much as digits as its factorization.

393932885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78786582.

The product of its digits is 1399680, while the sum is 50.

The square root of 393932885 is about 19847.7425668513. The cubic root of 393932885 is about 733.0620643820.

The spelling of 393932885 in words is "three hundred ninety-three million, nine hundred thirty-two thousand, eight hundred eighty-five".