1820395204 has 12 divisors (see below), whose sum is σ = 3239686800. Its totient is φ = 894770408.

The previous prime is 1820395201. The next prime is 1820395219. The reversal of 1820395204 is 4025930281.

It is a self number, because there is not a number n which added to its sum of digits gives 1820395204.

It is not an unprimeable number, because it can be changed into a prime (1820395201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3856534 + ... + 3857005.

It is an arithmetic number, because the mean of its divisors is an integer number (269973900).

Almost surely, 2^1820395204 is an apocalyptic number.

It is an amenable number.

1820395204 is a deficient number, since it is larger than the sum of its proper divisors (1419291596).

1820395204 is a wasteful number, since it uses less digits than its factorization.

1820395204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7713602 (or 7713600 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1820395204 is about 42666.0896263063. The cubic root of 1820395204 is about 1221.0175162601.

The spelling of 1820395204 in words is "one billion, eight hundred twenty million, three hundred ninety-five thousand, two hundred four".