688349 has 8 divisors (see below), whose sum is σ = 716352. Its totient is φ = 660960.

The previous prime is 688339. The next prime is 688357. The reversal of 688349 is 943886.

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 688349 - 2⁴ = 688333 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688309) 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, 4142 + ... + 4304.

It is an arithmetic number, because the mean of its divisors is an integer number (89544).

2⁶⁸⁸³⁴⁹ is an apocalyptic number.

It is an amenable number.

688349 is a deficient number, since it is larger than the sum of its proper divisors (28003).

688349 is a wasteful number, since it uses less digits than its factorization.

688349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307.

The product of its digits is 41472, while the sum is 38.

The square root of 688349 is about 829.6680058915. The cubic root of 688349 is about 88.2950239322.

The spelling of 688349 in words is "six hundred eighty-eight thousand, three hundred forty-nine".