1809721422 has 12 divisors (see below), whose sum is σ = 3921063120. Its totient is φ = 603240468.

The previous prime is 1809721409. The next prime is 1809721429. The reversal of 1809721422 is 2241279081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809721429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50270022 + ... + 50270057.

It is an arithmetic number, because the mean of its divisors is an integer number (326755260).

Almost surely, 2^1809721422 is an apocalyptic number.

1809721422 is an abundant number, since it is smaller than the sum of its proper divisors (2111341698).

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

1809721422 is a wasteful number, since it uses less digits than its factorization.

1809721422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100540087 (or 100540084 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1809721422 is about 42540.8206549897. The cubic root of 1809721422 is about 1218.6263815288.

The spelling of 1809721422 in words is "one billion, eight hundred nine million, seven hundred twenty-one thousand, four hundred twenty-two".