2004990 has 64 divisors (see below), whose sum is σ = 5334336. Its totient is φ = 479232.

The previous prime is 2004983. The next prime is 2004991. The reversal of 2004990 is 994002.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2004990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2004991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20622 + ... + 20718.

It is an arithmetic number, because the mean of its divisors is an integer number (83349).

2^2004990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2004990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2667168).

2004990 is an abundant number, since it is smaller than the sum of its proper divisors (3329346).

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

2004990 is a wasteful number, since it uses less digits than its factorization.

2004990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 2004990 is about 1415.9766947235. The cubic root of 2004990 is about 126.0968013992.

Adding to 2004990 its reverse (994002), we get a palindrome (2998992).

The spelling of 2004990 in words is "two million, four thousand, nine hundred ninety".