2221808 has 10 divisors (see below), whose sum is σ = 4304784. Its totient is φ = 1110896.

The previous prime is 2221789. The next prime is 2221829. The reversal of 2221808 is 8081222.

2221808 is digitally balanced in base 2 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 69416 + ... + 69447.

2^2221808 is an apocalyptic number.

It is an amenable number.

2221808 is a deficient number, since it is larger than the sum of its proper divisors (2082976).

2221808 is a wasteful number, since it uses less digits than its factorization.

2221808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138871 (or 138865 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 2221808 is about 1490.5730441679. The cubic root of 2221808 is about 130.4874794093.

The spelling of 2221808 in words is "two million, two hundred twenty-one thousand, eight hundred eight".