396866257 has 2 divisors, whose sum is σ = 396866258. Its totient is φ = 396866256.

The previous prime is 396866233. The next prime is 396866287. The reversal of 396866257 is 752668693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 380874256 + 15992001 = 19516^2 + 3999^2 .

It is a cyclic number.

It is not a de Polignac number, because 396866257 - 2¹⁹ = 396341969 is a prime.

It is not a weakly prime, because it can be changed into another prime (396866287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198433128 + 198433129.

It is an arithmetic number, because the mean of its divisors is an integer number (198433129).

Almost surely, 2^396866257 is an apocalyptic number.

It is an amenable number.

396866257 is a deficient number, since it is larger than the sum of its proper divisors (1).

396866257 is an equidigital number, since it uses as much as digits as its factorization.

396866257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 52.

The square root of 396866257 is about 19921.5023780838. The cubic root of 396866257 is about 734.8771183035.

It can be divided in two parts, 3968 and 66257, that added together give a square (70225 = 265²).

The spelling of 396866257 in words is "three hundred ninety-six million, eight hundred sixty-six thousand, two hundred fifty-seven".