686436 has 12 divisors (see below), whose sum is σ = 1601712. Its totient is φ = 228808.

The previous prime is 686423. The next prime is 686437. The reversal of 686436 is 634686.

686436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 686397 and 686406.

It is not an unprimeable number, because it can be changed into a prime (686437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28590 + ... + 28613.

It is an arithmetic number, because the mean of its divisors is an integer number (133476).

2⁶⁸⁶⁴³⁶ is an apocalyptic number.

It is an amenable number.

686436 is an abundant number, since it is smaller than the sum of its proper divisors (915276).

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

686436 is a wasteful number, since it uses less digits than its factorization.

686436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57210 (or 57208 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 686436 is about 828.5143330082. The cubic root of 686436 is about 88.2131540791.

The spelling of 686436 in words is "six hundred eighty-six thousand, four hundred thirty-six".