11865005 has 4 divisors (see below), whose sum is σ = 14238012. Its totient is φ = 9492000.

The previous prime is 11865001. The next prime is 11865013. The reversal of 11865005 is 50056811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1841449 + 10023556 = 1357^2 + 3166^2 .

It is not a de Polignac number, because 11865005 - 2² = 11865001 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 (11865001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1186496 + ... + 1186505.

It is an arithmetic number, because the mean of its divisors is an integer number (3559503).

Almost surely, 2^11865005 is an apocalyptic number.

It is an amenable number.

11865005 is a deficient number, since it is larger than the sum of its proper divisors (2373007).

11865005 is an equidigital number, since it uses as much as digits as its factorization.

11865005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373006.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 11865005 is about 3444.5616557118. The cubic root of 11865005 is about 228.0811050842.

The spelling of 11865005 in words is "eleven million, eight hundred sixty-five thousand, five".