1328557 has 4 divisors (see below), whose sum is σ = 1332000. Its totient is φ = 1325116.

The previous prime is 1328539. The next prime is 1328563. The reversal of 1328557 is 7558231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1328557 is a prime.

It is a Duffinian number.

1328557 is a lucky 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 (1328507) 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, 1057 + ... + 1942.

It is an arithmetic number, because the mean of its divisors is an integer number (333000).

2^1328557 is an apocalyptic number.

It is an amenable number.

1328557 is a deficient number, since it is larger than the sum of its proper divisors (3443).

1328557 is an equidigital number, since it uses as much as digits as its factorization.

1328557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3442.

The product of its digits is 8400, while the sum is 31.

The square root of 1328557 is about 1152.6304698384. The cubic root of 1328557 is about 109.9326585068.

The spelling of 1328557 in words is "one million, three hundred twenty-eight thousand, five hundred fifty-seven".