1686222 has 24 divisors (see below), whose sum is σ = 3813264. Its totient is φ = 537504.

The previous prime is 1686203. The next prime is 1686229. The reversal of 1686222 is 2226861.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1623 + ... + 2450.

It is an arithmetic number, because the mean of its divisors is an integer number (158886).

2^1686222 is an apocalyptic number.

1686222 is an abundant number, since it is smaller than the sum of its proper divisors (2127042).

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

1686222 is a wasteful number, since it uses less digits than its factorization.

1686222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4104 (or 4101 counting only the distinct ones).

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

The square root of 1686222 is about 1298.5461100785. The cubic root of 1686222 is about 119.0250165140.

The spelling of 1686222 in words is "one million, six hundred eighty-six thousand, two hundred twenty-two".