393694439 has 2 divisors, whose sum is σ = 393694440. Its totient is φ = 393694438.

The previous prime is 393694417. The next prime is 393694463. The reversal of 393694439 is 934496393.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 393694439 - 2²⁰ = 392645863 is a prime.

It is a super-2 number, since 2×393694439² = 309990622599049442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393694489) 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 as a sum of consecutive naturals, namely, 196847219 + 196847220.

It is an arithmetic number, because the mean of its divisors is an integer number (196847220).

Almost surely, 2^393694439 is an apocalyptic number.

393694439 is a deficient number, since it is larger than the sum of its proper divisors (1).

393694439 is an equidigital number, since it uses as much as digits as its factorization.

393694439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 50.

The square root of 393694439 is about 19841.7347779875. The cubic root of 393694439 is about 732.9141280175.

The spelling of 393694439 in words is "three hundred ninety-three million, six hundred ninety-four thousand, four hundred thirty-nine".