2188816 has 20 divisors (see below), whose sum is σ = 4846912. Its totient is φ = 938016.

The previous prime is 2188811. The next prime is 2188831. The reversal of 2188816 is 6188812.

It is not an unprimeable number, because it can be changed into a prime (2188811) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9660 + ... + 9883.

2^2188816 is an apocalyptic number.

It is an amenable number.

2188816 is an abundant number, since it is smaller than the sum of its proper divisors (2658096).

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

2188816 is a wasteful number, since it uses less digits than its factorization.

2188816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19558 (or 19552 counting only the distinct ones).

The product of its digits is 6144, while the sum is 34.

The square root of 2188816 is about 1479.4647680834. The cubic root of 2188816 is about 129.8383790316.

It can be divided in two parts, 21888 and 16, that added together give a square (21904 = 148²).

The spelling of 2188816 in words is "two million, one hundred eighty-eight thousand, eight hundred sixteen".