11988989 has 8 divisors (see below), whose sum is σ = 12260160. Its totient is φ = 11720800.

The previous prime is 11988979. The next prime is 11988997. The reversal of 11988989 is 98988911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11988989 - 2⁴ = 11988973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11988989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11988929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8657 + ... + 9945.

It is an arithmetic number, because the mean of its divisors is an integer number (1532520).

Almost surely, 2^11988989 is an apocalyptic number.

It is an amenable number.

11988989 is a deficient number, since it is larger than the sum of its proper divisors (271171).

11988989 is a wasteful number, since it uses less digits than its factorization.

11988989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491.

The product of its digits is 373248, while the sum is 53.

The square root of 11988989 is about 3462.5119494379. The cubic root of 11988989 is about 228.8728023679.

The spelling of 11988989 in words is "eleven million, nine hundred eighty-eight thousand, nine hundred eighty-nine".