1188985158 has 48 divisors (see below), whose sum is σ = 2710352736. Its totient is φ = 376202880.

The previous prime is 1188985157. The next prime is 1188985267. The reversal of 1188985158 is 8515898811.

1188985158 is a `hidden beast` number, since 118 + 8 + 9 + 8 + 515 + 8 = 666.

It is a super-3 number, since 3×1188985158³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188985153) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 5535 + ... + 49077.

It is an arithmetic number, because the mean of its divisors is an integer number (56465682).

Almost surely, 2^1188985158 is an apocalyptic number.

1188985158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1188985158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1355176368).

1188985158 is an abundant number, since it is smaller than the sum of its proper divisors (1521367578).

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

1188985158 is a wasteful number, since it uses less digits than its factorization.

1188985158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43629 (or 43626 counting only the distinct ones).

The product of its digits is 921600, while the sum is 54.

The square root of 1188985158 is about 34481.6640839737. The cubic root of 1188985158 is about 1059.3971765217.

The spelling of 1188985158 in words is "one billion, one hundred eighty-eight million, nine hundred eighty-five thousand, one hundred fifty-eight".