1328820 has 24 divisors (see below), whose sum is σ = 3720864. Its totient is φ = 354336.

The previous prime is 1328807. The next prime is 1328827. The reversal of 1328820 is 288231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11014 + ... + 11133.

It is an arithmetic number, because the mean of its divisors is an integer number (155036).

2^1328820 is an apocalyptic number.

1328820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1328820 is an abundant number, since it is smaller than the sum of its proper divisors (2392044).

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

1328820 is a wasteful number, since it uses less digits than its factorization.

1328820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22159 (or 22157 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 1328820 is about 1152.7445510606. The cubic root of 1328820 is about 109.9399120863.

The spelling of 1328820 in words is "one million, three hundred twenty-eight thousand, eight hundred twenty".