1328420 has 24 divisors (see below), whose sum is σ = 2817024. Its totient is φ = 526176.

The previous prime is 1328417. The next prime is 1328447. The reversal of 1328420 is 248231.

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

It is a junction number, because it is equal to n+sod(n) for n = 1328392 and 1328401.

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 7 ways as a sum of consecutive naturals, for example, 2279 + ... + 2801.

It is an arithmetic number, because the mean of its divisors is an integer number (117376).

2^1328420 is an apocalyptic number.

1328420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1328420 is an abundant number, since it is smaller than the sum of its proper divisors (1488604).

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

1328420 is a wasteful number, since it uses less digits than its factorization.

1328420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659 (or 657 counting only the distinct ones).

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

The square root of 1328420 is about 1152.5710390254. The cubic root of 1328420 is about 109.9288796470.

The spelling of 1328420 in words is "one million, three hundred twenty-eight thousand, four hundred twenty".