1328621 has 8 divisors (see below), whose sum is σ = 1544640. Its totient is φ = 1119168.

The previous prime is 1328617. The next prime is 1328647. The reversal of 1328621 is 1268231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1328621 - 2² = 1328617 is a prime.

It is a d-powerful number, because it can be written as 1 + 3³ + 2⁴ + 8² + 6⁷ + 2²⁰ + 1 .

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328611) 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 7 ways as a sum of consecutive naturals, for example, 1196 + ... + 2021.

It is an arithmetic number, because the mean of its divisors is an integer number (193080).

2^1328621 is an apocalyptic number.

It is an amenable number.

1328621 is a deficient number, since it is larger than the sum of its proper divisors (216019).

1328621 is an equidigital number, since it uses as much as digits as its factorization.

1328621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3283.

The product of its digits is 576, while the sum is 23.

The square root of 1328621 is about 1152.6582320879. The cubic root of 1328621 is about 109.9344237245.

The spelling of 1328621 in words is "one million, three hundred twenty-eight thousand, six hundred twenty-one".