2166684 has 96 divisors (see below), whose sum is σ = 6209280. Its totient is φ = 580608.

The previous prime is 2166679. The next prime is 2166691. The reversal of 2166684 is 4866612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50367 + ... + 50409.

It is an arithmetic number, because the mean of its divisors is an integer number (64680).

2^2166684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3104640).

2166684 is an abundant number, since it is smaller than the sum of its proper divisors (4042596).

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

2166684 is a wasteful number, since it uses less digits than its factorization.

2166684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 97 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 2166684 is about 1471.9660322168. The cubic root of 2166684 is about 129.3992796738.

It can be divided in two parts, 2166 and 684, that multiplied together give a cube (1481544 = 114³).

The spelling of 2166684 in words is "two million, one hundred sixty-six thousand, six hundred eighty-four".