2821686 has 48 divisors (see below), whose sum is σ = 6795264. Its totient is φ = 765072.

The previous prime is 2821681. The next prime is 2821699. The reversal of 2821686 is 6861282.

2821686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821681) 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 23 ways as a sum of consecutive naturals, for example, 22155 + ... + 22281.

It is an arithmetic number, because the mean of its divisors is an integer number (141568).

2^2821686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2821686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3397632).

2821686 is an abundant number, since it is smaller than the sum of its proper divisors (3973578).

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

2821686 is a wasteful number, since it uses less digits than its factorization.

2821686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 162 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 2821686 is about 1679.7874865589. The cubic root of 2821686 is about 141.3089147818.

The spelling of 2821686 in words is "two million, eight hundred twenty-one thousand, six hundred eighty-six".