8390257 has 2 divisors, whose sum is σ = 8390258. Its totient is φ = 8390256.

The previous prime is 8390233. The next prime is 8390273. The reversal of 8390257 is 7520938.

8390257 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6305121 + 2085136 = 2511^2 + 1444^2 .

It is a cyclic number.

It is not a de Polignac number, because 8390257 - 2¹¹ = 8388209 is a prime.

It is not a weakly prime, because it can be changed into another prime (8390227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4195128 + 4195129.

It is an arithmetic number, because the mean of its divisors is an integer number (4195129).

Almost surely, 2^8390257 is an apocalyptic number.

It is an amenable number.

8390257 is a deficient number, since it is larger than the sum of its proper divisors (1).

8390257 is an equidigital number, since it uses as much as digits as its factorization.

8390257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 8390257 is about 2896.5940343790. The cubic root of 8390257 is about 203.2006477055.

The spelling of 8390257 in words is "eight million, three hundred ninety thousand, two hundred fifty-seven".