686349998 has 8 divisors (see below), whose sum is σ = 1037040192. Its totient is φ = 340669936.

The previous prime is 686349997. The next prime is 686350019. The reversal of 686349998 is 899943686.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 686349998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686349997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1252190 + ... + 1252737.

It is an arithmetic number, because the mean of its divisors is an integer number (129630024).

Almost surely, 2^686349998 is an apocalyptic number.

686349998 is a deficient number, since it is larger than the sum of its proper divisors (350690194).

686349998 is a wasteful number, since it uses less digits than its factorization.

686349998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2505066.

The product of its digits is 20155392, while the sum is 62.

The square root of 686349998 is about 26198.2823482762. The cubic root of 686349998 is about 882.0946991694.

The spelling of 686349998 in words is "six hundred eighty-six million, three hundred forty-nine thousand, nine hundred ninety-eight".