2001789 has 12 divisors (see below), whose sum is σ = 2922556. Its totient is φ = 1320192.

The previous prime is 2001787. The next prime is 2001793. The reversal of 2001789 is 9871002.

It can be written as a sum of positive squares in 2 ways, for example, as 736164 + 1265625 = 858^2 + 1125^2 .

It is not a de Polignac number, because 2001789 - 2¹ = 2001787 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 274 + ... + 2019.

2^2001789 is an apocalyptic number.

It is an amenable number.

2001789 is a deficient number, since it is larger than the sum of its proper divisors (920767).

2001789 is a wasteful number, since it uses less digits than its factorization.

2001789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396 (or 2393 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 2001789 is about 1414.8459280077. The cubic root of 2001789 is about 126.0296604399.

The spelling of 2001789 in words is "two million, one thousand, seven hundred eighty-nine".