1329820 has 12 divisors (see below), whose sum is σ = 2792664. Its totient is φ = 531920.

The previous prime is 1329799. The next prime is 1329847. The reversal of 1329820 is 289231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33226 + ... + 33265.

It is an arithmetic number, because the mean of its divisors is an integer number (232722).

2^1329820 is an apocalyptic number.

1329820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1329820 is an abundant number, since it is smaller than the sum of its proper divisors (1462844).

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

1329820 is a wasteful number, since it uses less digits than its factorization.

1329820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66500 (or 66498 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1329820 is about 1153.1782169292. The cubic root of 1329820 is about 109.9674835019.

The spelling of 1329820 in words is "one million, three hundred twenty-nine thousand, eight hundred twenty".