689491 has 8 divisors (see below), whose sum is σ = 792000. Its totient is φ = 593640.

The previous prime is 689467. The next prime is 689509. The reversal of 689491 is 194986.

689491 is nontrivially palindromic in base 5.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 689491 - 2⁵ = 689459 is a prime.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 689491.

It is not an unprimeable number, because it can be changed into a prime (689411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1441 + ... + 1858.

It is an arithmetic number, because the mean of its divisors is an integer number (99000).

2⁶⁸⁹⁴⁹¹ is an apocalyptic number.

689491 is a deficient number, since it is larger than the sum of its proper divisors (102509).

689491 is a wasteful number, since it uses less digits than its factorization.

689491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3329.

The product of its digits is 15552, while the sum is 37.

The square root of 689491 is about 830.3559477718. The cubic root of 689491 is about 88.3438253429.

It can be divided in two parts, 68 and 9491, that added together give a palindrome (9559).

The spelling of 689491 in words is "six hundred eighty-nine thousand, four hundred ninety-one".