1804999999 has 4 divisors (see below), whose sum is σ = 1969090920. Its totient is φ = 1640909080.

The previous prime is 1804999969. The next prime is 1805000051. The reversal of 1804999999 is 9999994081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1804999999 - 2⁵ = 1804999967 is a prime.

It is a Duffinian number.

1804999999 is a modest number, since divided by 99999 gives 18049 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1804999969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82045444 + ... + 82045465.

It is an arithmetic number, because the mean of its divisors is an integer number (492272730).

Almost surely, 2^1804999999 is an apocalyptic number.

1804999999 is a deficient number, since it is larger than the sum of its proper divisors (164090921).

1804999999 is a wasteful number, since it uses less digits than its factorization.

1804999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164090920.

The product of its (nonzero) digits is 17006112, while the sum is 67.

The square root of 1804999999 is about 42485.2915607272. The cubic root of 1804999999 is about 1217.5656912976.

The spelling of 1804999999 in words is "one billion, eight hundred four million, nine hundred ninety-nine thousand, nine hundred ninety-nine".