1801820002 has 8 divisors (see below), whose sum is σ = 2729490012. Its totient is φ = 891990000.

The previous prime is 1801819997. The next prime is 1801820003. The reversal of 1801820002 is 2000281081.

It can be written as a sum of positive squares in 2 ways, for example, as 1466966601 + 334853401 = 38301^2 + 18299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1801820003) 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 3 ways as a sum of consecutive naturals, for example, 4459749 + ... + 4460152.

Almost surely, 2^1801820002 is an apocalyptic number.

1801820002 is a deficient number, since it is larger than the sum of its proper divisors (927670010).

1801820002 is a wasteful number, since it uses less digits than its factorization.

1801820002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8920004.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 1801820002 is about 42447.8503813797. The cubic root of 1801820002 is about 1216.8502469300.

The spelling of 1801820002 in words is "one billion, eight hundred one million, eight hundred twenty thousand, two".