1804889521 has 8 divisors (see below), whose sum is σ = 1814803200. Its totient is φ = 1794996000.

The previous prime is 1804889519. The next prime is 1804889549. The reversal of 1804889521 is 1259884081.

It is a happy number.

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 1804889521 - 2¹ = 1804889519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1804889551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196021 + ... + 205021.

It is an arithmetic number, because the mean of its divisors is an integer number (226850400).

Almost surely, 2^1804889521 is an apocalyptic number.

It is an amenable number.

1804889521 is a deficient number, since it is larger than the sum of its proper divisors (9913679).

1804889521 is an equidigital number, since it uses as much as digits as its factorization.

1804889521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10079.

The product of its (nonzero) digits is 184320, while the sum is 46.

The square root of 1804889521 is about 42483.9913496837. The cubic root of 1804889521 is about 1217.5408497524.

The spelling of 1804889521 in words is "one billion, eight hundred four million, eight hundred eighty-nine thousand, five hundred twenty-one".