686898 has 24 divisors (see below), whose sum is σ = 1537536. Its totient is φ = 221400.

The previous prime is 686897. The next prime is 686911. The reversal of 686898 is 898686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (64064).

2⁶⁸⁶⁸⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (768768).

686898 is an abundant number, since it is smaller than the sum of its proper divisors (850638).

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

686898 is a wasteful number, since it uses less digits than its factorization.

686898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270 (or 1267 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 686898 is about 828.7930984269. The cubic root of 686898 is about 88.2329400156.

The spelling of 686898 in words is "six hundred eighty-six thousand, eight hundred ninety-eight".