686379 has 4 divisors (see below), whose sum is σ = 915176. Its totient is φ = 457584.

The previous prime is 686363. The next prime is 686417. The reversal of 686379 is 973686.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 686379 - 2⁴ = 686363 is a prime.

It is a super-2 number, since 2×686379² = 942232263282, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114394 + ... + 114399.

It is an arithmetic number, because the mean of its divisors is an integer number (228794).

2⁶⁸⁶³⁷⁹ is an apocalyptic number.

686379 is a deficient number, since it is larger than the sum of its proper divisors (228797).

686379 is a wasteful number, since it uses less digits than its factorization.

686379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228796.

The product of its digits is 54432, while the sum is 39.

The square root of 686379 is about 828.4799333720. The cubic root of 686379 is about 88.2107123419.

The spelling of 686379 in words is "six hundred eighty-six thousand, three hundred seventy-nine".