2001005 has 16 divisors (see below), whose sum is σ = 2528064. Its totient is φ = 1518720.

The previous prime is 2000989. The next prime is 2001037. The reversal of 2001005 is 5001002.

2001005 = T₁₄ + T₁₅ + ... + T₂₂₈.

It is not a de Polignac number, because 2001005 - 2⁴ = 2000989 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2000983 and 2001001.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8702 + ... + 8928.

It is an arithmetic number, because the mean of its divisors is an integer number (158004).

2^2001005 is an apocalyptic number.

It is an amenable number.

2001005 is a deficient number, since it is larger than the sum of its proper divisors (527059).

2001005 is a wasteful number, since it uses less digits than its factorization.

2001005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316.

The product of its (nonzero) digits is 10, while the sum is 8.

The square root of 2001005 is about 1414.5688389046. The cubic root of 2001005 is about 126.0132051332.

Adding to 2001005 its reverse (5001002), we get a palindrome (7002007).

The spelling of 2001005 in words is "two million, one thousand, five".