11990305 has 4 divisors (see below), whose sum is σ = 14388372. Its totient is φ = 9592240.

The previous prime is 11990281. The next prime is 11990339. The reversal of 11990305 is 50309911.

11990305 = 2448² + 2449².

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 5992704 + 5997601 = 2448^2 + 2449^2 .

It is not a de Polignac number, because 11990305 - 2⁹ = 11989793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 1199026 + ... + 1199035.

It is an arithmetic number, because the mean of its divisors is an integer number (3597093).

Almost surely, 2^11990305 is an apocalyptic number.

11990305 is the 2449-th centered square number.

It is an amenable number.

11990305 is a deficient number, since it is larger than the sum of its proper divisors (2398067).

11990305 is an equidigital number, since it uses as much as digits as its factorization.

11990305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398066.

The product of its (nonzero) digits is 1215, while the sum is 28.

The square root of 11990305 is about 3462.7019796685. The cubic root of 11990305 is about 228.8811763180.

The spelling of 11990305 in words is "eleven million, nine hundred ninety thousand, three hundred five".