11909989 has 16 divisors (see below), whose sum is σ = 14963200. Its totient is φ = 9419760.

The previous prime is 11909971. The next prime is 11909999. The reversal of 11909989 is 98990911.

11909989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11909989 - 2¹¹ = 11907941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11909959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3124 + ... + 5794.

It is an arithmetic number, because the mean of its divisors is an integer number (935200).

Almost surely, 2^11909989 is an apocalyptic number.

It is an amenable number.

11909989 is a deficient number, since it is larger than the sum of its proper divisors (3053211).

11909989 is an equidigital number, since it uses as much as digits as its factorization.

11909989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2705 (or 2691 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 11909989 is about 3451.0851916462. The cubic root of 11909989 is about 228.3689841978.

The spelling of 11909989 in words is "eleven million, nine hundred nine thousand, nine hundred eighty-nine".