1328240 has 20 divisors (see below), whose sum is σ = 3088344. Its totient is φ = 531264.

The previous prime is 1328237. The next prime is 1328269. The reversal of 1328240 is 428231.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8222 + ... + 8381.

2^1328240 is an apocalyptic number.

1328240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1328240 is an abundant number, since it is smaller than the sum of its proper divisors (1760104).

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

1328240 is a wasteful number, since it uses less digits than its factorization.

1328240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16616 (or 16610 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1328240 is about 1152.4929500869. The cubic root of 1328240 is about 109.9239143267.

Subtracting from 1328240 its reverse (428231), we obtain a palindrome (900009).

The spelling of 1328240 in words is "one million, three hundred twenty-eight thousand, two hundred forty".