213686 has 12 divisors (see below), whose sum is σ = 352716. Its totient is φ = 97020.

The previous prime is 213659. The next prime is 213713. The reversal of 213686 is 686312.

213686 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (213659) and next prime (213713).

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 213686.

It is an unprimeable number.

213686 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 200 + ... + 683.

It is an arithmetic number, because the mean of its divisors is an integer number (29393).

2²¹³⁶⁸⁶ is an apocalyptic number.

213686 is a deficient number, since it is larger than the sum of its proper divisors (139030).

213686 is a wasteful number, since it uses less digits than its factorization.

213686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907 (or 896 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 213686 is about 462.2618305679. The cubic root of 213686 is about 59.7849710371.

Adding to 213686 its reverse (686312), we get a palindrome (899998).

It can be divided in two parts, 2136 and 86, that added together give a palindrome (2222).

The spelling of 213686 in words is "two hundred thirteen thousand, six hundred eighty-six".