1820002019 has 6 divisors (see below), whose sum is σ = 2000498220. Its totient is φ = 1654547180.

The previous prime is 1820002007. The next prime is 1820002021. The reversal of 1820002019 is 9102000281.

It is not a de Polignac number, because 1820002019 - 2²⁰ = 1818953443 is a prime.

It is a super-2 number, since 2×1820002019² = 6624814698328152722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1820001985 and 1820002003.

It is not an unprimeable number, because it can be changed into a prime (1820002049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7520549 + ... + 7520790.

It is an arithmetic number, because the mean of its divisors is an integer number (333416370).

Almost surely, 2^1820002019 is an apocalyptic number.

1820002019 is a deficient number, since it is larger than the sum of its proper divisors (180496201).

1820002019 is a wasteful number, since it uses less digits than its factorization.

1820002019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15041361 (or 15041350 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1820002019 is about 42661.4816784415. The cubic root of 1820002019 is about 1220.9296012221.

The spelling of 1820002019 in words is "one billion, eight hundred twenty million, two thousand, nineteen".