1328641 has 8 divisors (see below), whose sum is σ = 1410624. Its totient is φ = 1248720.

The previous prime is 1328617. The next prime is 1328647. The reversal of 1328641 is 1468231.

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 1328641 - 2¹⁵ = 1295873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 930 + ... + 1876.

It is an arithmetic number, because the mean of its divisors is an integer number (176328).

2^1328641 is an apocalyptic number.

It is an amenable number.

1328641 is a deficient number, since it is larger than the sum of its proper divisors (81983).

1328641 is an equidigital number, since it uses as much as digits as its factorization.

1328641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031.

The product of its digits is 1152, while the sum is 25.

The square root of 1328641 is about 1152.6669076537. Note that the first 3 decimals coincide. The cubic root of 1328641 is about 109.9349753434.

The spelling of 1328641 in words is "one million, three hundred twenty-eight thousand, six hundred forty-one".