689538 has 16 divisors (see below), whose sum is σ = 1413216. Its totient is φ = 224160.

The previous prime is 689509. The next prime is 689551. The reversal of 689538 is 835986.

It is a junction number, because it is equal to n+sod(n) for n = 689496 and 689505.

It is a congruent number.

It is an unprimeable number.

689538 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 1156 + ... + 1647.

It is an arithmetic number, because the mean of its divisors is an integer number (88326).

2⁶⁸⁹⁵³⁸ is an apocalyptic number.

689538 is an abundant number, since it is smaller than the sum of its proper divisors (723678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689538 is a wasteful number, since it uses less digits than its factorization.

689538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2849.

The product of its digits is 51840, while the sum is 39.

The square root of 689538 is about 830.3842484055. The cubic root of 689538 is about 88.3458326523.

The spelling of 689538 in words is "six hundred eighty-nine thousand, five hundred thirty-eight".