1428309 has 12 divisors (see below), whose sum is σ = 2078752. Its totient is φ = 945000.

The previous prime is 1428281. The next prime is 1428359. The reversal of 1428309 is 9038241.

It is a de Polignac number, because none of the positive numbers 2^k-1428309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 834 + ... + 1884.

2^1428309 is an apocalyptic number.

It is an amenable number.

1428309 is a deficient number, since it is larger than the sum of its proper divisors (650443).

1428309 is a wasteful number, since it uses less digits than its factorization.

1428309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208 (or 1205 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1428309 is about 1195.1188225444. The cubic root of 1428309 is about 112.6178912308.

The spelling of 1428309 in words is "one million, four hundred twenty-eight thousand, three hundred nine".