686938 has 16 divisors (see below), whose sum is σ = 1189440. Its totient is φ = 291456.

The previous prime is 686911. The next prime is 686947. The reversal of 686938 is 839686.

It is a self number, because there is not a number n which added to its sum of digits gives 686938.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1770 + ... + 2122.

It is an arithmetic number, because the mean of its divisors is an integer number (74340).

2⁶⁸⁶⁹³⁸ is an apocalyptic number.

686938 is a deficient number, since it is larger than the sum of its proper divisors (502502).

686938 is a wasteful number, since it uses less digits than its factorization.

686938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501.

The product of its digits is 62208, while the sum is 40.

The square root of 686938 is about 828.8172295506. The cubic root of 686938 is about 88.2346526664.

The spelling of 686938 in words is "six hundred eighty-six thousand, nine hundred thirty-eight".