11805215 has 4 divisors (see below), whose sum is σ = 14166264. Its totient is φ = 9444168.

The previous prime is 11805197. The next prime is 11805217. The reversal of 11805215 is 51250811.

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

It is a cyclic number.

It is not a de Polignac number, because 11805215 - 2⁸ = 11804959 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 (11805217) 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, 1180517 + ... + 1180526.

It is an arithmetic number, because the mean of its divisors is an integer number (3541566).

Almost surely, 2^11805215 is an apocalyptic number.

11805215 is a deficient number, since it is larger than the sum of its proper divisors (2361049).

11805215 is an equidigital number, since it uses as much as digits as its factorization.

11805215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361048.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 11805215 is about 3435.8717962113. The cubic root of 11805215 is about 227.6973451662.

The spelling of 11805215 in words is "eleven million, eight hundred five thousand, two hundred fifteen".