686420 has 24 divisors (see below), whose sum is σ = 1647744. Its totient is φ = 235296.

The previous prime is 686417. The next prime is 686423. The reversal of 686420 is 24686.

686420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (686417) and next prime (686423).

It is a self number, because there is not a number n which added to its sum of digits gives 686420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2312 + ... + 2591.

It is an arithmetic number, because the mean of its divisors is an integer number (68656).

2⁶⁸⁶⁴²⁰ is an apocalyptic number.

It is an amenable number.

686420 is an abundant number, since it is smaller than the sum of its proper divisors (961324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686420 is a wasteful number, since it uses less digits than its factorization.

686420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4919 (or 4917 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 686420 is about 828.5046771141. The cubic root of 686420 is about 88.2124686928.

The spelling of 686420 in words is "six hundred eighty-six thousand, four hundred twenty".