1428009 has 16 divisors (see below), whose sum is σ = 2101440. Its totient is φ = 855360.

The previous prime is 1427999. The next prime is 1428013. The reversal of 1428009 is 9008241.

It is not a de Polignac number, because 1428009 - 2⁸ = 1427753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1428009.

It is not an unprimeable number, because it can be changed into a prime (1428029) 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, 3399 + ... + 3795.

It is an arithmetic number, because the mean of its divisors is an integer number (131340).

2^1428009 is an apocalyptic number.

It is an amenable number.

1428009 is a deficient number, since it is larger than the sum of its proper divisors (673431).

1428009 is a wasteful number, since it uses less digits than its factorization.

1428009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1428009 is about 1194.9933054206. The cubic root of 1428009 is about 112.6100059779.

The spelling of 1428009 in words is "one million, four hundred twenty-eight thousand, nine".