1689859 has 4 divisors (see below), whose sum is σ = 1748160. Its totient is φ = 1631560.

The previous prime is 1689847. The next prime is 1689869. The reversal of 1689859 is 9589861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1689859 - 2¹⁷ = 1558787 is a prime.

It is a Duffinian number.

1689859 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1689829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29107 + ... + 29164.

It is an arithmetic number, because the mean of its divisors is an integer number (437040).

2^1689859 is an apocalyptic number.

1689859 is a deficient number, since it is larger than the sum of its proper divisors (58301).

1689859 is an equidigital number, since it uses as much as digits as its factorization.

1689859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58300.

The product of its digits is 155520, while the sum is 46.

The square root of 1689859 is about 1299.9457680996. The cubic root of 1689859 is about 119.1105297940.

The spelling of 1689859 in words is "one million, six hundred eighty-nine thousand, eight hundred fifty-nine".