2001023 has 12 divisors (see below), whose sum is σ = 2212848. Its totient is φ = 1805760.

The previous prime is 2000989. The next prime is 2001037. The reversal of 2001023 is 3201002.

It is not a de Polignac number, because 2001023 - 2⁶ = 2000959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8183 + ... + 8423.

It is an arithmetic number, because the mean of its divisors is an integer number (184404).

2^2001023 is an apocalyptic number.

2001023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2001023 is a deficient number, since it is larger than the sum of its proper divisors (211825).

2001023 is a wasteful number, since it uses less digits than its factorization.

2001023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 2001023 is about 1414.5752012530. The cubic root of 2001023 is about 126.0135829818.

Adding to 2001023 its reverse (3201002), we get a palindrome (5202025).

The spelling of 2001023 in words is "two million, one thousand, twenty-three".