1820804 has 6 divisors (see below), whose sum is σ = 3186414. Its totient is φ = 910400.

The previous prime is 1820783. The next prime is 1820809. The reversal of 1820804 is 4080281.

It can be written as a sum of positive squares in only one way, i.e., 1098304 + 722500 = 1048^2 + 850^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1820804.

It is not an unprimeable number, because it can be changed into a prime (1820809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 227597 + ... + 227604.

It is an arithmetic number, because the mean of its divisors is an integer number (531069).

2^1820804 is an apocalyptic number.

It is an amenable number.

1820804 is a deficient number, since it is larger than the sum of its proper divisors (1365610).

1820804 is a wasteful number, since it uses less digits than its factorization.

1820804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455205 (or 455203 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 1820804 is about 1349.3717056467. The cubic root of 1820804 is about 122.1108908451.

The spelling of 1820804 in words is "one million, eight hundred twenty thousand, eight hundred four".