689867 has 2 divisors, whose sum is σ = 689868. Its totient is φ = 689866.

The previous prime is 689851. The next prime is 689869. The reversal of 689867 is 768986.

689867 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689867 - 2⁴ = 689851 is a prime.

Together with 689869, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 689867.

It is not a weakly prime, because it can be changed into another prime (689869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344933 + 344934.

It is an arithmetic number, because the mean of its divisors is an integer number (344934).

2⁶⁸⁹⁸⁶⁷ is an apocalyptic number.

689867 is a deficient number, since it is larger than the sum of its proper divisors (1).

689867 is an equidigital number, since it uses as much as digits as its factorization.

689867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 689867 is about 830.5823258413. The cubic root of 689867 is about 88.3598812653.

The spelling of 689867 in words is "six hundred eighty-nine thousand, eight hundred sixty-seven".