393844385 has 16 divisors (see below), whose sum is σ = 515963520. Its totient is φ = 286218240.

The previous prime is 393844343. The next prime is 393844393. The reversal of 393844385 is 583448393.

It is a happy number.

393844385 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 393844385 - 2¹² = 393840289 is a prime.

It is a super-2 number, since 2×393844385² = 310226799192056450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145121 + ... + 147809.

It is an arithmetic number, because the mean of its divisors is an integer number (32247720).

Almost surely, 2^393844385 is an apocalyptic number.

It is an amenable number.

393844385 is a deficient number, since it is larger than the sum of its proper divisors (122119135).

393844385 is a wasteful number, since it uses less digits than its factorization.

393844385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5368.

The product of its digits is 1244160, while the sum is 47.

The square root of 393844385 is about 19845.5129689308. The cubic root of 393844385 is about 733.0071642928.

The spelling of 393844385 in words is "three hundred ninety-three million, eight hundred forty-four thousand, three hundred eighty-five".