2019904 has 28 divisors (see below), whose sum is σ = 4121404. Its totient is φ = 981504.

The previous prime is 2019881. The next prime is 2019907. The reversal of 2019904 is 4099102.

It can be written as a sum of positive squares in 2 ways, for example, as 921600 + 1098304 = 960^2 + 1048^2 .

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2019907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1942 + ... + 2794.

It is an arithmetic number, because the mean of its divisors is an integer number (147193).

2^2019904 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 2019904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2060702).

2019904 is an abundant number, since it is smaller than the sum of its proper divisors (2101500).

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

2019904 is an equidigital number, since it uses as much as digits as its factorization.

2019904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902 (or 892 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 2019904 is about 1421.2332672718. The cubic root of 2019904 is about 126.4086839091.

The spelling of 2019904 in words is "two million, nineteen thousand, nine hundred four".