818393 has 2 divisors, whose sum is σ = 818394. Its totient is φ = 818392.

The previous prime is 818383. The next prime is 818399. The reversal of 818393 is 393818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 635209 + 183184 = 797^2 + 428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-818393 is a prime.

It is a super-3 number, since 3×818393³ = 1644398124823633371, which contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (818399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409196 + 409197.

It is an arithmetic number, because the mean of its divisors is an integer number (409197).

2⁸¹⁸³⁹³ is an apocalyptic number.

It is an amenable number.

818393 is a deficient number, since it is larger than the sum of its proper divisors (1).

818393 is an equidigital number, since it uses as much as digits as its factorization.

818393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 818393 is about 904.6507613438. The cubic root of 818393 is about 93.5378324980.

The spelling of 818393 in words is "eight hundred eighteen thousand, three hundred ninety-three".