1808921422 has 64 divisors (see below), whose sum is σ = 3452004864. Its totient is φ = 690531840.

The previous prime is 1808921419. The next prime is 1808921437. The reversal of 1808921422 is 2241298081.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1750618 + ... + 1751650.

It is an arithmetic number, because the mean of its divisors is an integer number (53937576).

Almost surely, 2^1808921422 is an apocalyptic number.

1808921422 is a deficient number, since it is larger than the sum of its proper divisors (1643083442).

1808921422 is a wasteful number, since it uses less digits than its factorization.

1808921422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 1808921422 is about 42531.4168821120. The cubic root of 1808921422 is about 1218.4467876269.

The spelling of 1808921422 in words is "one billion, eight hundred eight million, nine hundred twenty-one thousand, four hundred twenty-two".