1999045404 has 72 divisors (see below), whose sum is σ = 5442877440. Its totient is φ = 616587552.

The previous prime is 1999045381. The next prime is 1999045421. The reversal of 1999045404 is 4045409991.

1999045404 is a `hidden beast` number, since 19 + 9 + 90 + 4 + 540 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1999045404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4572 + ... + 63395.

It is an arithmetic number, because the mean of its divisors is an integer number (75595520).

Almost surely, 2^1999045404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999045404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2721438720).

1999045404 is an abundant number, since it is smaller than the sum of its proper divisors (3443832036).

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

1999045404 is a wasteful number, since it uses less digits than its factorization.

1999045404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68039 (or 68034 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1999045404 is about 44710.6855684410. The cubic root of 1999045404 is about 1259.7205653954.

The spelling of 1999045404 in words is "one billion, nine hundred ninety-nine million, forty-five thousand, four hundred four".