1188218238 has 16 divisors (see below), whose sum is σ = 2501512320. Its totient is φ = 375226776.

The previous prime is 1188218209. The next prime is 1188218243. The reversal of 1188218238 is 8328128811.

It is a super-2 number, since 2×1188218238² = 2823725162231649288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1188218238.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5211370 + ... + 5211597.

It is an arithmetic number, because the mean of its divisors is an integer number (156344520).

Almost surely, 2^1188218238 is an apocalyptic number.

1188218238 is an abundant number, since it is smaller than the sum of its proper divisors (1313294082).

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

1188218238 is a wasteful number, since it uses less digits than its factorization.

1188218238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10422991.

The product of its digits is 49152, while the sum is 42.

The square root of 1188218238 is about 34470.5415971377. The cubic root of 1188218238 is about 1059.1693498391.

The spelling of 1188218238 in words is "one billion, one hundred eighty-eight million, two hundred eighteen thousand, two hundred thirty-eight".