11988558 has 12 divisors (see below), whose sum is σ = 25975248. Its totient is φ = 3996180.

The previous prime is 11988541. The next prime is 11988569. The reversal of 11988558 is 85588911.

11988558 is a `hidden beast` number, since 1 + 1 + 98 + 8 + 558 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 332998 + ... + 333033.

It is an arithmetic number, because the mean of its divisors is an integer number (2164604).

Almost surely, 2^11988558 is an apocalyptic number.

11988558 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11988558 is an abundant number, since it is smaller than the sum of its proper divisors (13986690).

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

11988558 is a wasteful number, since it uses less digits than its factorization.

11988558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666039 (or 666036 counting only the distinct ones).

The product of its digits is 115200, while the sum is 45.

The square root of 11988558 is about 3462.4497108261. The cubic root of 11988558 is about 228.8700597024.

The spelling of 11988558 in words is "eleven million, nine hundred eighty-eight thousand, five hundred fifty-eight".