2188312 has 32 divisors (see below), whose sum is σ = 4896000. Its totient is φ = 896544.

The previous prime is 2188309. The next prime is 2188327. The reversal of 2188312 is 2138812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439 + ... + 2137.

It is an arithmetic number, because the mean of its divisors is an integer number (153000).

2^2188312 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 2188312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2448000).

2188312 is an abundant number, since it is smaller than the sum of its proper divisors (2707688).

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

2188312 is a wasteful number, since it uses less digits than its factorization.

2188312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735 (or 1731 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 2188312 is about 1479.2944264074. The cubic root of 2188312 is about 129.8284126744.

It can be divided in two parts, 2188 and 312, that added together give a square (2500 = 50²).

The spelling of 2188312 in words is "two million, one hundred eighty-eight thousand, three hundred twelve".