1800004521 has 16 divisors (see below), whose sum is σ = 2743459200. Its totient is φ = 1028350848.

The previous prime is 1800004519. The next prime is 1800004559. The reversal of 1800004521 is 1254000081.

It is not a de Polignac number, because 1800004521 - 2¹ = 1800004519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

1800004521 is a modest number, since divided by 4521 gives 18 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1800004511) 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 15 ways as a sum of consecutive naturals, for example, 171925 + ... + 182093.

It is an arithmetic number, because the mean of its divisors is an integer number (171466200).

Almost surely, 2^1800004521 is an apocalyptic number.

It is an amenable number.

1800004521 is a deficient number, since it is larger than the sum of its proper divisors (943454679).

1800004521 is a wasteful number, since it uses less digits than its factorization.

1800004521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18608.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1800004521 is about 42426.4601516554. The cubic root of 1800004521 is about 1216.4414175448.

The spelling of 1800004521 in words is "one billion, eight hundred million, four thousand, five hundred twenty-one".