688398 has 24 divisors (see below), whose sum is σ = 1466232. Its totient is φ = 215424.

The previous prime is 688397. The next prime is 688403. The reversal of 688398 is 893886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688393) 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 11 ways as a sum of consecutive naturals, for example, 1536 + ... + 1932.

It is an arithmetic number, because the mean of its divisors is an integer number (61093).

2⁶⁸⁸³⁹⁸ is an apocalyptic number.

688398 is an abundant number, since it is smaller than the sum of its proper divisors (777834).

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

688398 is a wasteful number, since it uses less digits than its factorization.

688398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 419 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 688398 is about 829.6975352500. The cubic root of 688398 is about 88.2971189710.

The spelling of 688398 in words is "six hundred eighty-eight thousand, three hundred ninety-eight".