393969393 has 32 divisors (see below), whose sum is σ = 596380800. Its totient is φ = 256981248.

The previous prime is 393969383. The next prime is 393969403.

393969393 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (393969383) and next prime (393969403).

It is not a de Polignac number, because 393969393 - 2⁵ = 393969361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (393969353) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269298 + ... + 270756.

It is an arithmetic number, because the mean of its divisors is an integer number (18636900).

Almost surely, 2^393969393 is an apocalyptic number.

It is an amenable number.

393969393 is a deficient number, since it is larger than the sum of its proper divisors (202411407).

393969393 is a wasteful number, since it uses less digits than its factorization.

393969393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678 (or 1672 counting only the distinct ones).

The product of its digits is 3188646, while the sum is 54.

The square root of 393969393 is about 19848.6622471138. The cubic root of 393969393 is about 733.0847093588.

The spelling of 393969393 in words is "three hundred ninety-three million, nine hundred sixty-nine thousand, three hundred ninety-three".