1999404 has 108 divisors (see below), whose sum is σ = 6099912. Its totient is φ = 570240.

The previous prime is 1999379. The next prime is 1999423. The reversal of 1999404 is 4049991.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 117604 + ... + 117620.

2^1999404 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 1999404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3049956).

1999404 is an abundant number, since it is smaller than the sum of its proper divisors (4100508).

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

1999404 is a wasteful number, since it uses less digits than its factorization.

1999404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58 (or 33 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1999404 is about 1414.0028288515. The cubic root of 1999404 is about 125.9795885303.

The spelling of 1999404 in words is "one million, nine hundred ninety-nine thousand, four hundred four".