686487 has 4 divisors (see below), whose sum is σ = 915320. Its totient is φ = 457656.

The previous prime is 686479. The next prime is 686503. The reversal of 686487 is 784686.

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

It is not a de Polignac number, because 686487 - 2³ = 686479 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686487.

It is not an unprimeable number, because it can be changed into a prime (686417) 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, 114412 + ... + 114417.

It is an arithmetic number, because the mean of its divisors is an integer number (228830).

2⁶⁸⁶⁴⁸⁷ is an apocalyptic number.

686487 is a deficient number, since it is larger than the sum of its proper divisors (228833).

686487 is a wasteful number, since it uses less digits than its factorization.

686487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228832.

The product of its digits is 64512, while the sum is 39.

The square root of 686487 is about 828.5451104195. The cubic root of 686487 is about 88.2153386767.

It can be divided in two parts, 68 and 6487, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 686487 in words is "six hundred eighty-six thousand, four hundred eighty-seven".