686142 has 12 divisors (see below), whose sum is σ = 1486680. Its totient is φ = 228708.

The previous prime is 686141. The next prime is 686143. The reversal of 686142 is 241686.

It is an interprime number because it is at equal distance from previous prime (686141) and next prime (686143).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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 686142.

It is not an unprimeable number, because it can be changed into a prime (686141) 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 5 ways as a sum of consecutive naturals, for example, 19042 + ... + 19077.

It is an arithmetic number, because the mean of its divisors is an integer number (123890).

2⁶⁸⁶¹⁴² is an apocalyptic number.

686142 is an abundant number, since it is smaller than the sum of its proper divisors (800538).

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

686142 is a wasteful number, since it uses less digits than its factorization.

686142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38127 (or 38124 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 686142 is about 828.3368879870. The cubic root of 686142 is about 88.2005584058.

It can be divided in two parts, 6861 and 42, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 686142 in words is "six hundred eighty-six thousand, one hundred forty-two".