686098 has 12 divisors (see below), whose sum is σ = 1197342. Its totient is φ = 294000.

The previous prime is 686089. The next prime is 686099. The reversal of 686098 is 890686.

It can be written as a sum of positive squares in only one way, i.e., 603729 + 82369 = 777^2 + 287^2 .

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (686099) by changing a digit.

686098 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3403 + ... + 3598.

2⁶⁸⁶⁰⁹⁸ is an apocalyptic number.

686098 is a deficient number, since it is larger than the sum of its proper divisors (511244).

686098 is a wasteful number, since it uses less digits than its factorization.

686098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7017 (or 7010 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 686098 is about 828.3103283190. The cubic root of 686098 is about 88.1986730295.

The spelling of 686098 in words is "six hundred eighty-six thousand, ninety-eight".