1220804 has 24 divisors (see below), whose sum is σ = 2437848. Its totient is φ = 529920.

The previous prime is 1220803. The next prime is 1220819. The reversal of 1220804 is 4080221.

It can be written as a sum of positive squares in 4 ways, for example, as 122500 + 1098304 = 350^2 + 1048^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (1220801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194 + ... + 1574.

It is an arithmetic number, because the mean of its divisors is an integer number (101577).

2^1220804 is an apocalyptic number.

It is an amenable number.

1220804 is a deficient number, since it is larger than the sum of its proper divisors (1217044).

1220804 is a wasteful number, since it uses less digits than its factorization.

1220804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415 (or 1413 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1220804 is about 1104.8999954747. The cubic root of 1220804 is about 106.8764404808.

The spelling of 1220804 in words is "one million, two hundred twenty thousand, eight hundred four".