1990099404 has 18 divisors (see below), whose sum is σ = 5030529140. Its totient is φ = 663366456.

The previous prime is 1990099381. The next prime is 1990099409. The reversal of 1990099404 is 4049900991.

1990099404 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1990099404.

It is not an unprimeable number, because it can be changed into a prime (1990099409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27640234 + ... + 27640305.

Almost surely, 2^1990099404 is an apocalyptic number.

It is an amenable number.

1990099404 is an abundant number, since it is smaller than the sum of its proper divisors (3040429736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1990099404 is a wasteful number, since it uses less digits than its factorization.

1990099404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55280549 (or 55280544 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 1990099404 is about 44610.5301918729. The cubic root of 1990099404 is about 1257.8386149965.

The spelling of 1990099404 in words is "one billion, nine hundred ninety million, ninety-nine thousand, four hundred four".