1328904 has 24 divisors (see below), whose sum is σ = 3599310. Its totient is φ = 442944.

The previous prime is 1328897. The next prime is 1328909. The reversal of 1328904 is 4098231.

It can be written as a sum of positive squares in only one way, i.e., 1004004 + 324900 = 1002^2 + 570^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (1328909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9157 + ... + 9300.

2^1328904 is an apocalyptic number.

It is an amenable number.

1328904 is an abundant number, since it is smaller than the sum of its proper divisors (2270406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1328904 is a wasteful number, since it uses less digits than its factorization.

1328904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18469 (or 18462 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1328904 is about 1152.7809852700. The cubic root of 1328904 is about 109.9422286173.

The spelling of 1328904 in words is "one million, three hundred twenty-eight thousand, nine hundred four".