1686213 has 24 divisors (see below), whose sum is σ = 2628288. Its totient is φ = 1037952.

The previous prime is 1686203. The next prime is 1686229. The reversal of 1686213 is 3126861.

It is not a de Polignac number, because 1686213 - 2⁴ = 1686197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15706 + ... + 15812.

It is an arithmetic number, because the mean of its divisors is an integer number (109512).

2^1686213 is an apocalyptic number.

It is an amenable number.

1686213 is a deficient number, since it is larger than the sum of its proper divisors (942075).

1686213 is a wasteful number, since it uses less digits than its factorization.

1686213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 230 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1686213 is about 1298.5426446598. The cubic root of 1686213 is about 119.0248047532.

The spelling of 1686213 in words is "one million, six hundred eighty-six thousand, two hundred thirteen".