1218227828 has 12 divisors (see below), whose sum is σ = 2166848292. Its totient is φ = 599128320.

The previous prime is 1218227789. The next prime is 1218227839. The reversal of 1218227828 is 8287228121.

It can be written as a sum of positive squares in 2 ways, for example, as 651883024 + 566344804 = 25532^2 + 23798^2 .

It is a congruent number.

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, 2496125 + ... + 2496612.

It is an arithmetic number, because the mean of its divisors is an integer number (180570691).

Almost surely, 2^1218227828 is an apocalyptic number.

It is an amenable number.

1218227828 is a deficient number, since it is larger than the sum of its proper divisors (948620464).

1218227828 is a wasteful number, since it uses less digits than its factorization.

1218227828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4992802 (or 4992800 counting only the distinct ones).

The product of its digits is 57344, while the sum is 41.

The square root of 1218227828 is about 34903.1206054702. The cubic root of 1218227828 is about 1068.0120973348.

The spelling of 1218227828 in words is "one billion, two hundred eighteen million, two hundred twenty-seven thousand, eight hundred twenty-eight".