686998 has 8 divisors (see below), whose sum is σ = 1109808. Its totient is φ = 317064.

The previous prime is 686993. The next prime is 687007. The reversal of 686998 is 899686.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13186 + ... + 13237.

It is an arithmetic number, because the mean of its divisors is an integer number (138726).

2⁶⁸⁶⁹⁹⁸ is an apocalyptic number.

686998 is a deficient number, since it is larger than the sum of its proper divisors (422810).

686998 is a wasteful number, since it uses less digits than its factorization.

686998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26438.

The product of its digits is 186624, while the sum is 46.

The square root of 686998 is about 828.8534249190. The cubic root of 686998 is about 88.2372215178.

The spelling of 686998 in words is "six hundred eighty-six thousand, nine hundred ninety-eight".