1080821 has 8 divisors (see below), whose sum is σ = 1256640. Its totient is φ = 910368.

The previous prime is 1080817. The next prime is 1080823. The reversal of 1080821 is 1280801.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1080821 - 2² = 1080817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1080793 and 1080802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1080823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 896 + ... + 1721.

It is an arithmetic number, because the mean of its divisors is an integer number (157080).

2^1080821 is an apocalyptic number.

It is an amenable number.

1080821 is a deficient number, since it is larger than the sum of its proper divisors (175819).

1080821 is an equidigital number, since it uses as much as digits as its factorization.

1080821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1080821 is about 1039.6254133100. The cubic root of 1080821 is about 102.6245481833.

Subtracting from 1080821 its sum of digits (20), we obtain a palindrome (1080801).

The spelling of 1080821 in words is "one million, eighty thousand, eight hundred twenty-one".