8420393 has 2 divisors, whose sum is σ = 8420394. Its totient is φ = 8420392.

The previous prime is 8420351. The next prime is 8420407. The reversal of 8420393 is 3930248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8219689 + 200704 = 2867^2 + 448^2 .

It is a cyclic number.

It is not a de Polignac number, because 8420393 - 2²⁰ = 7371817 is a prime.

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 (8426393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210196 + 4210197.

It is an arithmetic number, because the mean of its divisors is an integer number (4210197).

Almost surely, 2^8420393 is an apocalyptic number.

It is an amenable number.

8420393 is a deficient number, since it is larger than the sum of its proper divisors (1).

8420393 is an equidigital number, since it uses as much as digits as its factorization.

8420393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 8420393 is about 2901.7913432912. The cubic root of 8420393 is about 203.4436413626.

The spelling of 8420393 in words is "eight million, four hundred twenty thousand, three hundred ninety-three".