2043990 has 48 divisors (see below), whose sum is σ = 5726448. Its totient is φ = 502848.

The previous prime is 2043989. The next prime is 2043997. The reversal of 2043990 is 993402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2043997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 297 + ... + 2043.

It is an arithmetic number, because the mean of its divisors is an integer number (119301).

2^2043990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2043990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2863224).

2043990 is an abundant number, since it is smaller than the sum of its proper divisors (3682458).

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

2043990 is a wasteful number, since it uses less digits than its factorization.

2043990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773 (or 1770 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 2043990 is about 1429.6817827755. The cubic root of 2043990 is about 126.9091461718.

The spelling of 2043990 in words is "two million, forty-three thousand, nine hundred ninety".