689189 has 4 divisors (see below), whose sum is σ = 690924. Its totient is φ = 687456.

The previous prime is 689167. The next prime is 689201. The reversal of 689189 is 981986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 981986 = 2 ⋅490993.

It can be written as a sum of positive squares in 2 ways, for example, as 24964 + 664225 = 158^2 + 815^2 .

It is a cyclic number.

It is not a de Polignac number, because 689189 - 2¹² = 685093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689089) 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 in 3 ways as a sum of consecutive naturals, for example, 59 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (172731).

2⁶⁸⁹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

689189 is a deficient number, since it is larger than the sum of its proper divisors (1735).

689189 is a wasteful number, since it uses less digits than its factorization.

689189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734.

The product of its digits is 31104, while the sum is 41.

The square root of 689189 is about 830.1740781306. The cubic root of 689189 is about 88.3309251351.

It can be divided in two parts, 689 and 189, that added together give a palindrome (878).

The spelling of 689189 in words is "six hundred eighty-nine thousand, one hundred eighty-nine".