2000001 has 4 divisors (see below), whose sum is σ = 2666672.
Its totient is φ = 1333332.
The previous prime is 1999993. The next prime is 2000003. The reversal of 2000001 is 1000002.
Adding to 2000001 its reverse (1000002), we get a palindrome (3000003).
Subtracting from 2000001 its reverse (1000002), we obtain a palindrome (999999).
Multipling 2000001 by its reverse (1000002), we get a palindrome (2000005000002).
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is not a de Polignac number, because 2000001 - 23 = 1999993 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (3), and also a Moran number because the ratio is a prime number: 666667 = 2000001 / (2 + 0 + 0 + 0 + 0 + 0 + 1).
It is a D-number.
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 2000001.
It is not an unprimeable number, because it can be changed into a prime (2000003) 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, 333331 + ... + 333336.
It is an arithmetic number, because the mean of its divisors is an integer number (666668).
22000001 is an apocalyptic number.
It is an amenable number.
2000001 is a deficient number, since it is larger than the sum of its proper divisors (666671).
2000001 is an equidigital number, since it uses as much as digits as its factorization.
2000001 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 666670.
The product of its (nonzero) digits is 2, while the sum is 3.
The square root of 2000001 is about 1414.2139159264.
The cubic root of 2000001 is about 125.9921259882.
The spelling of 2000001 in words is "two million, one", and thus it is an aban number and an uban number.