393918938 has 24 divisors (see below), whose sum is σ = 701980992. Its totient is φ = 165228504.

The previous prime is 393918937. The next prime is 393918961. The reversal of 393918938 is 839819393.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 393918938.

It is not an unprimeable number, because it can be changed into a prime (393918937) 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 11 ways as a sum of consecutive naturals, for example, 38156 + ... + 47367.

It is an arithmetic number, because the mean of its divisors is an integer number (29249208).

Almost surely, 2^393918938 is an apocalyptic number.

393918938 is a deficient number, since it is larger than the sum of its proper divisors (308062054).

393918938 is a wasteful number, since it uses less digits than its factorization.

393918938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85586 (or 85579 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 53.

The square root of 393918938 is about 19847.3912139606. The cubic root of 393918938 is about 733.0534130460.

The spelling of 393918938 in words is "three hundred ninety-three million, nine hundred eighteen thousand, nine hundred thirty-eight".