13128305 has 8 divisors (see below), whose sum is σ = 15792192. Its totient is φ = 10477168.

The previous prime is 13128293. The next prime is 13128319. The reversal of 13128305 is 50382131.

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

It is a cyclic number.

It is not a de Polignac number, because 13128305 - 2⁴ = 13128289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749 + ... + 5178.

It is an arithmetic number, because the mean of its divisors is an integer number (1974024).

Almost surely, 2^13128305 is an apocalyptic number.

It is an amenable number.

13128305 is a deficient number, since it is larger than the sum of its proper divisors (2663887).

13128305 is an equidigital number, since it uses as much as digits as its factorization.

13128305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6375.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 13128305 is about 3623.3002911710. The cubic root of 13128305 is about 235.9044966921.

The spelling of 13128305 in words is "thirteen million, one hundred twenty-eight thousand, three hundred five".