1328890 has 16 divisors (see below), whose sum is σ = 2533032. Its totient is φ = 500224.

The previous prime is 1328863. The next prime is 1328891. The reversal of 1328890 is 988231.

It can be written as a sum of positive squares in 4 ways, for example, as 797449 + 531441 = 893^2 + 729^2 .

It is not an unprimeable number, because it can be changed into a prime (1328891) 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, 3739 + ... + 4078.

2^1328890 is an apocalyptic number.

1328890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1328890 is a deficient number, since it is larger than the sum of its proper divisors (1204142).

1328890 is a wasteful number, since it uses less digits than its factorization.

1328890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7841.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1328890 is about 1152.7749129817. The cubic root of 1328890 is about 109.9418425356.

The spelling of 1328890 in words is "one million, three hundred twenty-eight thousand, eight hundred ninety".