11809005 has 32 divisors (see below), whose sum is σ = 21240576. Its totient is φ = 5558784.

The previous prime is 11809001. The next prime is 11809009. The reversal of 11809005 is 50090811.

11809005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11809001) and next prime (11809009).

It is not a de Polignac number, because 11809005 - 2² = 11809001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11809001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3169 + ... + 5801.

It is an arithmetic number, because the mean of its divisors is an integer number (663768).

Almost surely, 2^11809005 is an apocalyptic number.

11809005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11809005 is a deficient number, since it is larger than the sum of its proper divisors (9431571).

11809005 is a wasteful number, since it uses less digits than its factorization.

11809005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677.

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 11809005 is about 3436.4232859181. The cubic root of 11809005 is about 227.7217095567.

Adding to 11809005 its reverse (50090811), we get a palindrome (61899816).

The spelling of 11809005 in words is "eleven million, eight hundred nine thousand, five".