11985558 has 32 divisors (see below), whose sum is σ = 26519136. Its totient is φ = 3587328.

The previous prime is 11985551. The next prime is 11985559. The reversal of 11985558 is 85558911.

It is a super-3 number, since 3×11985558³ (a number of 22 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 (11985551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 810 + ... + 4962.

It is an arithmetic number, because the mean of its divisors is an integer number (828723).

Almost surely, 2^11985558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11985558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13259568).

11985558 is an abundant number, since it is smaller than the sum of its proper divisors (14533578).

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

11985558 is a wasteful number, since it uses less digits than its factorization.

11985558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4208.

The product of its digits is 72000, while the sum is 42.

The square root of 11985558 is about 3462.0164644323. The cubic root of 11985558 is about 228.8509674018.

The spelling of 11985558 in words is "eleven million, nine hundred eighty-five thousand, five hundred fifty-eight".