1328509 has 12 divisors (see below), whose sum is σ = 1645536. Its totient is φ = 1050192.

The previous prime is 1328507. The next prime is 1328521. The reversal of 1328509 is 9058231.

It is not a de Polignac number, because 1328509 - 2¹ = 1328507 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328501) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 622 + ... + 1744.

It is an arithmetic number, because the mean of its divisors is an integer number (137128).

2^1328509 is an apocalyptic number.

It is an amenable number.

1328509 is a deficient number, since it is larger than the sum of its proper divisors (317027).

1328509 is a wasteful number, since it uses less digits than its factorization.

1328509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156 (or 1143 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1328509 is about 1152.6096477125. The cubic root of 1328509 is about 109.9313345563.

The spelling of 1328509 in words is "one million, three hundred twenty-eight thousand, five hundred nine".