818428393 has 2 divisors, whose sum is σ = 818428394. Its totient is φ = 818428392.

The previous prime is 818428361. The next prime is 818428397. The reversal of 818428393 is 393824818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 532547929 + 285880464 = 23077^2 + 16908^2 .

It is a cyclic number.

It is not a de Polignac number, because 818428393 - 2⁵ = 818428361 is a prime.

It is not a weakly prime, because it can be changed into another prime (818428397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409214196 + 409214197.

It is an arithmetic number, because the mean of its divisors is an integer number (409214197).

Almost surely, 2^818428393 is an apocalyptic number.

It is an amenable number.

818428393 is a deficient number, since it is larger than the sum of its proper divisors (1).

818428393 is an equidigital number, since it uses as much as digits as its factorization.

818428393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 46.

The square root of 818428393 is about 28608.1875168631. The cubic root of 818428393 is about 935.3918088717.

The spelling of 818428393 in words is "eight hundred eighteen million, four hundred twenty-eight thousand, three hundred ninety-three".