11887209 has 16 divisors (see below), whose sum is σ = 17836800. Its totient is φ = 7823088.

The previous prime is 11887201. The next prime is 11887219. The reversal of 11887209 is 90278811.

11887209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11887209 - 2³ = 11887201 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11887201) 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, 654 + ... + 4919.

It is an arithmetic number, because the mean of its divisors is an integer number (1114800).

Almost surely, 2^11887209 is an apocalyptic number.

It is an amenable number.

11887209 is a deficient number, since it is larger than the sum of its proper divisors (5949591).

11887209 is an equidigital number, since it uses as much as digits as its factorization.

11887209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5661 (or 5655 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 11887209 is about 3447.7832008408. The cubic root of 11887209 is about 228.2232923271.

The spelling of 11887209 in words is "eleven million, eight hundred eighty-seven thousand, two hundred nine".