1428609 has 16 divisors (see below), whose sum is σ = 2344832. Its totient is φ = 753408.

The previous prime is 1428601. The next prime is 1428613. The reversal of 1428609 is 9068241.

It is not a de Polignac number, because 1428609 - 2³ = 1428601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1428601) 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, 2344 + ... + 2889.

It is an arithmetic number, because the mean of its divisors is an integer number (146552).

2^1428609 is an apocalyptic number.

It is an amenable number.

1428609 is a deficient number, since it is larger than the sum of its proper divisors (916223).

1428609 is a wasteful number, since it uses less digits than its factorization.

1428609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5256.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1428609 is about 1195.2443264873. The cubic root of 1428609 is about 112.6257753797.

The spelling of 1428609 in words is "one million, four hundred twenty-eight thousand, six hundred nine".