2001000 has 128 divisors (see below), whose sum is σ = 6739200. Its totient is φ = 492800.

The previous prime is 2000989. The next prime is 2001037. The reversal of 2001000 is 1002.

2001000 is nontrivially palindromic in base 9.

2001000 is a nontrivial binomial coefficient, being equal to C(2001, 2).

It is a Harshad number since it is a multiple of its sum of digits (3).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68986 + ... + 69014.

It is an arithmetic number, because the mean of its divisors is an integer number (52650).

2^2001000 is an apocalyptic number.

2001000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

2001000 is the 2000-th triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3369600).

2001000 is an abundant number, since it is smaller than the sum of its proper divisors (4738200).

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

2001000 is a wasteful number, since it uses less digits than its factorization.

2001000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 62 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 3.

The square root of 2001000 is about 1414.5670715806. The cubic root of 2001000 is about 126.0131001748.

Adding to 2001000 its reverse (1002), we get a palindrome (2002002).

The spelling of 2001000 in words is "two million, one thousand".