393694417 has 2 divisors, whose sum is σ = 393694418. Its totient is φ = 393694416.

The previous prime is 393694397. The next prime is 393694439. The reversal of 393694417 is 714496393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204604416 + 189090001 = 14304^2 + 13751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-393694417 is a prime.

It is not a weakly prime, because it can be changed into another prime (393694487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196847208 + 196847209.

It is an arithmetic number, because the mean of its divisors is an integer number (196847209).

Almost surely, 2^393694417 is an apocalyptic number.

It is an amenable number.

393694417 is a deficient number, since it is larger than the sum of its proper divisors (1).

393694417 is an equidigital number, since it uses as much as digits as its factorization.

393694417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 46.

The square root of 393694417 is about 19841.7342236005. The cubic root of 393694417 is about 732.9141143656.

The spelling of 393694417 in words is "three hundred ninety-three million, six hundred ninety-four thousand, four hundred seventeen".