11188989 has 32 divisors (see below), whose sum is σ = 19319040. Its totient is φ = 6267456.

The previous prime is 11188979. The next prime is 11188997. The reversal of 11188989 is 98988111.

It is not a de Polignac number, because 11188989 - 2⁴ = 11188973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11188939) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9459 + ... + 10575.

It is an arithmetic number, because the mean of its divisors is an integer number (603720).

Almost surely, 2^11188989 is an apocalyptic number.

It is an amenable number.

11188989 is a deficient number, since it is larger than the sum of its proper divisors (8130051).

11188989 is a wasteful number, since it uses less digits than its factorization.

11188989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186 (or 1180 counting only the distinct ones).

The product of its digits is 41472, while the sum is 45.

The square root of 11188989 is about 3344.9946188298. The cubic root of 11188989 is about 223.6644436376.

The spelling of 11188989 in words is "eleven million, one hundred eighty-eight thousand, nine hundred eighty-nine".