1428305 has 4 divisors (see below), whose sum is σ = 1713972. Its totient is φ = 1142640.

The previous prime is 1428281. The next prime is 1428359. The reversal of 1428305 is 5038241.

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 982081 + 446224 = 991^2 + 668^2 .

It is not a de Polignac number, because 1428305 - 2¹⁰ = 1427281 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142826 + ... + 142835.

It is an arithmetic number, because the mean of its divisors is an integer number (428493).

2^1428305 is an apocalyptic number.

It is an amenable number.

1428305 is a deficient number, since it is larger than the sum of its proper divisors (285667).

1428305 is an equidigital number, since it uses as much as digits as its factorization.

1428305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285666.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1428305 is about 1195.1171490695. The cubic root of 1428305 is about 112.6177861014.

The spelling of 1428305 in words is "one million, four hundred twenty-eight thousand, three hundred five".