686040 has 32 divisors (see below), whose sum is σ = 2058480. Its totient is φ = 182912.

The previous prime is 686039. The next prime is 686041. The reversal of 686040 is 40686.

It is an interprime number because it is at equal distance from previous prime (686039) and next prime (686041).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 686040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686041) 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, 2739 + ... + 2978.

2⁶⁸⁶⁰⁴⁰ is an apocalyptic number.

686040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

686040 is an abundant number, since it is smaller than the sum of its proper divisors (1372440).

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

686040 is a wasteful number, since it uses less digits than its factorization.

686040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731 (or 5727 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 686040 is about 828.2753165464. The cubic root of 686040 is about 88.1961876376.

The spelling of 686040 in words is "six hundred eighty-six thousand, forty".