2001819 has 4 divisors (see below), whose sum is σ = 2669096. Its totient is φ = 1334544.

The previous prime is 2001809. The next prime is 2001833. The reversal of 2001819 is 9181002.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2001819 - 2⁵ = 2001787 is a prime.

It is a super-2 number, since 2×2001819² = 8014558617522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001795 and 2001804.

It is not an unprimeable number, because it can be changed into a prime (2001809) 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 3 ways as a sum of consecutive naturals, for example, 333634 + ... + 333639.

It is an arithmetic number, because the mean of its divisors is an integer number (667274).

2^2001819 is an apocalyptic number.

2001819 is a deficient number, since it is larger than the sum of its proper divisors (667277).

2001819 is an equidigital number, since it uses as much as digits as its factorization.

2001819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667276.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 2001819 is about 1414.8565298291. The cubic root of 2001819 is about 126.0302900219.

The spelling of 2001819 in words is "two million, one thousand, eight hundred nineteen".