860689 has 2 divisors, whose sum is σ = 860690. Its totient is φ = 860688.

The previous prime is 860663. The next prime is 860701. The reversal of 860689 is 986068.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 795664 + 65025 = 892^2 + 255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-860689 is a prime.

It is an Ulam number.

860689 is a lucky number.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (860609) 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, 430344 + 430345.

It is an arithmetic number, because the mean of its divisors is an integer number (430345).

2⁸⁶⁰⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

860689 is a deficient number, since it is larger than the sum of its proper divisors (1).

860689 is an equidigital number, since it uses as much as digits as its factorization.

860689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 860689 is about 927.7332590783. The cubic root of 860689 is about 95.1222433718.

The spelling of 860689 in words is "eight hundred sixty thousand, six hundred eighty-nine".