860309 has 2 divisors, whose sum is σ = 860310. Its totient is φ = 860308.

The previous prime is 860297. The next prime is 860311. The reversal of 860309 is 903068.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 605284 + 255025 = 778^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 860309 - 2¹² = 856213 is a prime.

It is a Sophie Germain prime.

Together with 860311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (860369) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430154 + 430155.

It is an arithmetic number, because the mean of its divisors is an integer number (430155).

2⁸⁶⁰³⁰⁹ is an apocalyptic number.

It is an amenable number.

860309 is a deficient number, since it is larger than the sum of its proper divisors (1).

860309 is an equidigital number, since it uses as much as digits as its factorization.

860309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 860309 is about 927.5284362218. The cubic root of 860309 is about 95.1082422737.

The spelling of 860309 in words is "eight hundred sixty thousand, three hundred nine".