1803005990 has 16 divisors (see below), whose sum is σ = 3247177248. Its totient is φ = 720809856.

The previous prime is 1803005983. The next prime is 1803005999. The reversal of 1803005990 is 995003081.

It is a self number, because there is not a number n which added to its sum of digits gives 1803005990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1803005999) 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, 29402 + ... + 66861.

It is an arithmetic number, because the mean of its divisors is an integer number (202948578).

Almost surely, 2^1803005990 is an apocalyptic number.

1803005990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1803005990 is a deficient number, since it is larger than the sum of its proper divisors (1444171258).

1803005990 is a wasteful number, since it uses less digits than its factorization.

1803005990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98143.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1803005990 is about 42461.8180251388. The cubic root of 1803005990 is about 1217.1171720882.

The spelling of 1803005990 in words is "one billion, eight hundred three million, five thousand, nine hundred ninety".