2003989 has 4 divisors (see below), whose sum is σ = 2158156. Its totient is φ = 1849824.

The previous prime is 2003971. The next prime is 2003999. The reversal of 2003989 is 9893002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 339889 + 1664100 = 583^2 + 1290^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003989 - 2⁷ = 2003861 is a prime.

2003989 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2003989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003959) 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, 77064 + ... + 77089.

It is an arithmetic number, because the mean of its divisors is an integer number (539539).

2^2003989 is an apocalyptic number.

It is an amenable number.

2003989 is a deficient number, since it is larger than the sum of its proper divisors (154167).

2003989 is a wasteful number, since it uses less digits than its factorization.

2003989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154166.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 2003989 is about 1415.6231843255. The cubic root of 2003989 is about 126.0758131133.

It can be divided in two parts, 2003 and 989, that added together give a palindrome (2992).

The spelling of 2003989 in words is "two million, three thousand, nine hundred eighty-nine".