11866005 has 24 divisors (see below), whose sum is σ = 20648472. Its totient is φ = 6303744.

The previous prime is 11865989. The next prime is 11866009. The reversal of 11866005 is 50066811.

It can be written as a sum of positive squares in 4 ways, for example, as 7017201 + 4848804 = 2649^2 + 2202^2 .

It is not a de Polignac number, because 11866005 - 2⁴ = 11865989 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11866005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11866009) 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 23 ways as a sum of consecutive naturals, for example, 20277 + ... + 20853.

It is an arithmetic number, because the mean of its divisors is an integer number (860353).

Almost surely, 2^11866005 is an apocalyptic number.

11866005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11866005 is a deficient number, since it is larger than the sum of its proper divisors (8782467).

11866005 is a wasteful number, since it uses less digits than its factorization.

11866005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045 (or 1042 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 11866005 is about 3444.7068090042. The cubic root of 11866005 is about 228.0875125741.

The spelling of 11866005 in words is "eleven million, eight hundred sixty-six thousand, five".