11989558 has 16 divisors (see below), whose sum is σ = 20611584. Its totient is φ = 5123880.

The previous prime is 11989553. The next prime is 11989597. The reversal of 11989558 is 85598911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11989553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5041 + ... + 7027.

It is an arithmetic number, because the mean of its divisors is an integer number (1288224).

Almost surely, 2^11989558 is an apocalyptic number.

11989558 is a deficient number, since it is larger than the sum of its proper divisors (8622026).

11989558 is a wasteful number, since it uses less digits than its factorization.

11989558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427.

The product of its digits is 129600, while the sum is 46.

The square root of 11989558 is about 3462.5941142444. The cubic root of 11989558 is about 228.8764230948.

The spelling of 11989558 in words is "eleven million, nine hundred eighty-nine thousand, five hundred fifty-eight".