393913331 has 16 divisors (see below), whose sum is σ = 463014144. Its totient is φ = 328140384.

The previous prime is 393913321. The next prime is 393913343. The reversal of 393913331 is 133319393.

It is not a de Polignac number, because 393913331 - 2²² = 389719027 is a prime.

It is a super-2 number, since 2×393913331² = 310335424679031122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 393913291 and 393913300.

It is not an unprimeable number, because it can be changed into a prime (393913321) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 34736 + ... + 44658.

It is an arithmetic number, because the mean of its divisors is an integer number (28938384).

Almost surely, 2^393913331 is an apocalyptic number.

393913331 is a deficient number, since it is larger than the sum of its proper divisors (69100813).

393913331 is a wasteful number, since it uses less digits than its factorization.

393913331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10090.

The product of its digits is 19683, while the sum is 35.

The square root of 393913331 is about 19847.2499606369. The cubic root of 393913331 is about 733.0499349615.

The spelling of 393913331 in words is "three hundred ninety-three million, nine hundred thirteen thousand, three hundred thirty-one".