11280305 has 8 divisors (see below), whose sum is σ = 13689000. Its totient is φ = 8922496.

The previous prime is 11280287. The next prime is 11280307. The reversal of 11280305 is 50308211.

It can be written as a sum of positive squares in 4 ways, for example, as 97969 + 11182336 = 313^2 + 3344^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11280305 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11280307) 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 7 ways as a sum of consecutive naturals, for example, 12230 + ... + 13119.

It is an arithmetic number, because the mean of its divisors is an integer number (1711125).

Almost surely, 2^11280305 is an apocalyptic number.

It is an amenable number.

11280305 is a deficient number, since it is larger than the sum of its proper divisors (2408695).

11280305 is an equidigital number, since it uses as much as digits as its factorization.

11280305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25443.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 11280305 is about 3358.6165306566. The cubic root of 11280305 is about 224.2712554117.

Adding to 11280305 its reverse (50308211), we get a palindrome (61588516).

The spelling of 11280305 in words is "eleven million, two hundred eighty thousand, three hundred five".