393998911 has 2 divisors, whose sum is σ = 393998912. Its totient is φ = 393998910.

The previous prime is 393998897. The next prime is 393999019. The reversal of 393998911 is 119899393.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 393998911 - 2¹⁷ = 393867839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393999911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196999455 + 196999456.

It is an arithmetic number, because the mean of its divisors is an integer number (196999456).

Almost surely, 2^393998911 is an apocalyptic number.

393998911 is a deficient number, since it is larger than the sum of its proper divisors (1).

393998911 is an equidigital number, since it uses as much as digits as its factorization.

393998911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472392, while the sum is 52.

The square root of 393998911 is about 19849.4058097465. The cubic root of 393998911 is about 733.1030175950.

The spelling of 393998911 in words is "three hundred ninety-three million, nine hundred ninety-eight thousand, nine hundred eleven".