686038 has 4 divisors (see below), whose sum is σ = 1029060. Its totient is φ = 343018.

The previous prime is 686029. The next prime is 686039. The reversal of 686038 is 830686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 830686 = 2 ⋅415343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171508 + ... + 171511.

It is an arithmetic number, because the mean of its divisors is an integer number (257265).

2⁶⁸⁶⁰³⁸ is an apocalyptic number.

686038 is a deficient number, since it is larger than the sum of its proper divisors (343022).

686038 is a wasteful number, since it uses less digits than its factorization.

686038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343021.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 686038 is about 828.2741092175. The cubic root of 686038 is about 88.1961019320.

The spelling of 686038 in words is "six hundred eighty-six thousand, thirty-eight".