13280305 has 16 divisors (see below), whose sum is σ = 16308864. Its totient is φ = 10379520.

The previous prime is 13280303. The next prime is 13280317. The reversal of 13280305 is 50308231.

It is not a de Polignac number, because 13280305 - 2¹ = 13280303 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (13280303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54985 + ... + 55225.

It is an arithmetic number, because the mean of its divisors is an integer number (1019304).

Almost surely, 2^13280305 is an apocalyptic number.

It is an amenable number.

13280305 is a deficient number, since it is larger than the sum of its proper divisors (3028559).

13280305 is a wasteful number, since it uses less digits than its factorization.

13280305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 13280305 is about 3644.2152790416. The cubic root of 13280305 is about 236.8114424198.

Adding to 13280305 its reverse (50308231), we get a palindrome (63588536).

The spelling of 13280305 in words is "thirteen million, two hundred eighty thousand, three hundred five".