1809944228 has 12 divisors (see below), whose sum is σ = 3202991820. Its totient is φ = 894803712.

The previous prime is 1809944189. The next prime is 1809944263. The reversal of 1809944228 is 8224499081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 946054564 + 863889664 = 30758^2 + 29392^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2541701 + ... + 2542412.

It is an arithmetic number, because the mean of its divisors is an integer number (266915985).

Almost surely, 2^1809944228 is an apocalyptic number.

It is an amenable number.

1809944228 is a deficient number, since it is larger than the sum of its proper divisors (1393047592).

1809944228 is a wasteful number, since it uses less digits than its factorization.

1809944228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5084206 (or 5084204 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 47.

The square root of 1809944228 is about 42543.4393061962. The cubic root of 1809944228 is about 1218.6763903542.

The spelling of 1809944228 in words is "one billion, eight hundred nine million, nine hundred forty-four thousand, two hundred twenty-eight".