686457 has 12 divisors (see below), whose sum is σ = 1003860. Its totient is φ = 451968.

The previous prime is 686453. The next prime is 686473. The reversal of 686457 is 754686.

It is a happy number.

686457 is a `hidden beast` number, since 6 + 8 + 645 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 404496 + 281961 = 636^2 + 531^2 .

It is not a de Polignac number, because 686457 - 2² = 686453 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686457.

It is not an unprimeable number, because it can be changed into a prime (686453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 373 + ... + 1229.

It is an arithmetic number, because the mean of its divisors is an integer number (83655).

2⁶⁸⁶⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

686457 is a deficient number, since it is larger than the sum of its proper divisors (317403).

686457 is a wasteful number, since it uses less digits than its factorization.

686457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952 (or 949 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 686457 is about 828.5270061983. The cubic root of 686457 is about 88.2140536324.

The spelling of 686457 in words is "six hundred eighty-six thousand, four hundred fifty-seven".