1078821 has 6 divisors (see below), whose sum is σ = 1558310. Its totient is φ = 719208.

The previous prime is 1078817. The next prime is 1078841. The reversal of 1078821 is 1288701.

It can be written as a sum of positive squares in only one way, i.e., 1028196 + 50625 = 1014^2 + 225^2 .

It is not a de Polignac number, because 1078821 - 2² = 1078817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1078841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59926 + ... + 59943.

2^1078821 is an apocalyptic number.

It is an amenable number.

1078821 is a deficient number, since it is larger than the sum of its proper divisors (479489).

1078821 is a wasteful number, since it uses less digits than its factorization.

1078821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119875 (or 119872 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 1078821 is about 1038.6630830062. The cubic root of 1078821 is about 102.5612087319.

The spelling of 1078821 in words is "one million, seventy-eight thousand, eight hundred twenty-one".