1198843218 has 12 divisors (see below), whose sum is σ = 2597493678. Its totient is φ = 399614400.

The previous prime is 1198843211. The next prime is 1198843223. The reversal of 1198843218 is 8123488911.

It can be written as a sum of positive squares in only one way, i.e., 770229009 + 428614209 = 27753^2 + 20703^2 .

It is a super-2 number, since 2×1198843218² = 2874450122689191048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1198843211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33301183 + ... + 33301218.

Almost surely, 2^1198843218 is an apocalyptic number.

1198843218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1198843218 is an abundant number, since it is smaller than the sum of its proper divisors (1398650460).

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

1198843218 is a wasteful number, since it uses less digits than its factorization.

1198843218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66602409 (or 66602406 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 1198843218 is about 34624.3154156151. The cubic root of 1198843218 is about 1062.3169970954.

The spelling of 1198843218 in words is "one billion, one hundred ninety-eight million, eight hundred forty-three thousand, two hundred eighteen".