1813228444 has 24 divisors (see below), whose sum is σ = 3421630800. Its totient is φ = 837947520.

The previous prime is 1813228423. The next prime is 1813228481. The reversal of 1813228444 is 4448223181.

It is a super-2 number, since 2×1813228444² = 6575594780261322272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287839 + ... + 294070.

It is an arithmetic number, because the mean of its divisors is an integer number (142567950).

Almost surely, 2^1813228444 is an apocalyptic number.

It is an amenable number.

1813228444 is a deficient number, since it is larger than the sum of its proper divisors (1608402356).

1813228444 is a wasteful number, since it uses less digits than its factorization.

1813228444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581973 (or 581971 counting only the distinct ones).

The product of its digits is 49152, while the sum is 37.

The square root of 1813228444 is about 42582.0201963223. The cubic root of 1813228444 is about 1219.4130572708.

The spelling of 1813228444 in words is "one billion, eight hundred thirteen million, two hundred twenty-eight thousand, four hundred forty-four".