865957 has 2 divisors, whose sum is σ = 865958. Its totient is φ = 865956.

The previous prime is 865937. The next prime is 865979. The reversal of 865957 is 759568.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 863041 + 2916 = 929^2 + 54^2 .

It is a cyclic number.

It is not a de Polignac number, because 865957 - 2⁷ = 865829 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432978 + 432979.

It is an arithmetic number, because the mean of its divisors is an integer number (432979).

2⁸⁶⁵⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

865957 is a deficient number, since it is larger than the sum of its proper divisors (1).

865957 is an equidigital number, since it uses as much as digits as its factorization.

865957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The square root of 865957 is about 930.5681060514. The cubic root of 865957 is about 95.3159196301.

The spelling of 865957 in words is "eight hundred sixty-five thousand, nine hundred fifty-seven".