860257 has 2 divisors, whose sum is σ = 860258. Its totient is φ = 860256.

The previous prime is 860239. The next prime is 860267. The reversal of 860257 is 752068.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 772641 + 87616 = 879^2 + 296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-860257 is a prime.

It is a Chen prime.

It is the 928-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (860267) by changing a digit.

It is a nontrivial repunit in base 927.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430128 + 430129.

It is an arithmetic number, because the mean of its divisors is an integer number (430129).

2⁸⁶⁰²⁵⁷ is an apocalyptic number.

It is an amenable number.

860257 is a deficient number, since it is larger than the sum of its proper divisors (1).

860257 is an equidigital number, since it uses as much as digits as its factorization.

860257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 860257 is about 927.5004043126. The cubic root of 860257 is about 95.1063260133.

The spelling of 860257 in words is "eight hundred sixty thousand, two hundred fifty-seven".