684446393 has 2 divisors, whose sum is σ = 684446394. Its totient is φ = 684446392.

The previous prime is 684446381. The next prime is 684446407. The reversal of 684446393 is 393644486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 555214969 + 129231424 = 23563^2 + 11368^2 .

It is a cyclic number.

It is not a de Polignac number, because 684446393 - 2⁴ = 684446377 is a prime.

It is not a weakly prime, because it can be changed into another prime (684446353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342223196 + 342223197.

It is an arithmetic number, because the mean of its divisors is an integer number (342223197).

Almost surely, 2^684446393 is an apocalyptic number.

It is an amenable number.

684446393 is a deficient number, since it is larger than the sum of its proper divisors (1).

684446393 is an equidigital number, since it uses as much as digits as its factorization.

684446393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 47.

The square root of 684446393 is about 26161.9264007833. The cubic root of 684446393 is about 881.2784418297.

The spelling of 684446393 in words is "six hundred eighty-four million, four hundred forty-six thousand, three hundred ninety-three".