11989909 has 4 divisors (see below), whose sum is σ = 12141760. Its totient is φ = 11838060.

The previous prime is 11989897. The next prime is 11989919. The reversal of 11989909 is 90998911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90998911 = 311 ⋅292601.

It is a cyclic number.

It is not a de Polignac number, because 11989909 - 2⁷ = 11989781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11989919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75807 + ... + 75964.

It is an arithmetic number, because the mean of its divisors is an integer number (3035440).

Almost surely, 2^11989909 is an apocalyptic number.

It is an amenable number.

11989909 is a deficient number, since it is larger than the sum of its proper divisors (151851).

11989909 is an equidigital number, since it uses as much as digits as its factorization.

11989909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151850.

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

The square root of 11989909 is about 3462.6447984164. The cubic root of 11989909 is about 228.8786565616.

The spelling of 11989909 in words is "eleven million, nine hundred eighty-nine thousand, nine hundred nine".