1330821 has 12 divisors (see below), whose sum is σ = 1951872. Its totient is φ = 873576.

The previous prime is 1330789. The next prime is 1330831. The reversal of 1330821 is 1280331.

It is not a de Polignac number, because 1330821 - 2⁵ = 1330789 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1330794 and 1330803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1330831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 501 + ... + 1706.

It is an arithmetic number, because the mean of its divisors is an integer number (162656).

2^1330821 is an apocalyptic number.

It is an amenable number.

1330821 is a deficient number, since it is larger than the sum of its proper divisors (621051).

1330821 is a wasteful number, since it uses less digits than its factorization.

1330821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280 (or 2277 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1330821 is about 1153.6121531953. The cubic root of 1330821 is about 109.9950686495.

The spelling of 1330821 in words is "one million, three hundred thirty thousand, eight hundred twenty-one".