1990811804 has 12 divisors (see below), whose sum is σ = 3484442304. Its totient is φ = 995256864.

The previous prime is 1990811783. The next prime is 1990811819. The reversal of 1990811804 is 4081180991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3884 + ... + 63219.

It is an arithmetic number, because the mean of its divisors is an integer number (290370192).

Almost surely, 2^1990811804 is an apocalyptic number.

It is an amenable number.

1990811804 is a deficient number, since it is larger than the sum of its proper divisors (1493630500).

1990811804 is a wasteful number, since it uses less digits than its factorization.

1990811804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74524 (or 74522 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 41.

The square root of 1990811804 is about 44618.5141393122. The cubic root of 1990811804 is about 1257.9886874542.

The spelling of 1990811804 in words is "one billion, nine hundred ninety million, eight hundred eleven thousand, eight hundred four".