11387209 has 4 divisors (see below), whose sum is σ = 11602116. Its totient is φ = 11172304.

The previous prime is 11387183. The next prime is 11387219. The reversal of 11387209 is 90278311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90278311 = 4243 ⋅21277.

It can be written as a sum of positive squares in 2 ways, for example, as 10220809 + 1166400 = 3197^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 11387209 - 2¹⁹ = 10862921 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11387219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107374 + ... + 107479.

It is an arithmetic number, because the mean of its divisors is an integer number (2900529).

Almost surely, 2^11387209 is an apocalyptic number.

It is an amenable number.

11387209 is a deficient number, since it is larger than the sum of its proper divisors (214907).

11387209 is an equidigital number, since it uses as much as digits as its factorization.

11387209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214906.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 11387209 is about 3374.4938879779. The cubic root of 11387209 is about 224.9775055701.

The spelling of 11387209 in words is "eleven million, three hundred eighty-seven thousand, two hundred nine".