1328609 has 4 divisors (see below), whose sum is σ = 1342404. Its totient is φ = 1314816.

The previous prime is 1328603. The next prime is 1328611. The reversal of 1328609 is 9068231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9068231 = 199 ⋅45569.

It can be written as a sum of positive squares in 2 ways, for example, as 247009 + 1081600 = 497^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328609 - 2¹² = 1324513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6752 + ... + 6945.

It is an arithmetic number, because the mean of its divisors is an integer number (335601).

2^1328609 is an apocalyptic number.

It is an amenable number.

1328609 is a deficient number, since it is larger than the sum of its proper divisors (13795).

1328609 is an equidigital number, since it uses as much as digits as its factorization.

1328609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13794.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1328609 is about 1152.6530267171. The cubic root of 1328609 is about 109.9340927505.

The spelling of 1328609 in words is "one million, three hundred twenty-eight thousand, six hundred nine".