686471 has 4 divisors (see below), whose sum is σ = 688200. Its totient is φ = 684744.

The previous prime is 686453. The next prime is 686473. The reversal of 686471 is 174686.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686471 is a prime.

It is a super-3 number, since 3×686471³ = 970482794403795333, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686473) 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, 65 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (172050).

2⁶⁸⁶⁴⁷¹ is an apocalyptic number.

686471 is a deficient number, since it is larger than the sum of its proper divisors (1729).

686471 is a wasteful number, since it uses less digits than its factorization.

686471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728.

The product of its digits is 8064, while the sum is 32.

The square root of 686471 is about 828.5354548841. The cubic root of 686471 is about 88.2146533244.

The spelling of 686471 in words is "six hundred eighty-six thousand, four hundred seventy-one".