2003840 has 64 divisors (see below), whose sum is σ = 4993920. Its totient is φ = 768000.

The previous prime is 2003839. The next prime is 2003857. The reversal of 2003840 is 483002.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19790 + ... + 19890.

It is an arithmetic number, because the mean of its divisors is an integer number (78030).

2^2003840 is an apocalyptic number.

2003840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2003840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2496960).

2003840 is an abundant number, since it is smaller than the sum of its proper divisors (2990080).

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

2003840 is a wasteful number, since it uses less digits than its factorization.

2003840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2003840 is about 1415.5705563482. The cubic root of 2003840 is about 126.0726883853.

Adding to 2003840 its reverse (483002), we get a palindrome (2486842).

The spelling of 2003840 in words is "two million, three thousand, eight hundred forty".