2081903818 has 4 divisors (see below), whose sum is σ = 3122855730. Its totient is φ = 1040951908.

The previous prime is 2081903783. The next prime is 2081903821. The reversal of 2081903818 is 8183091802.

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

It can be written as a sum of positive squares in only one way, i.e., 1874630209 + 207273609 = 43297^2 + 14397^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520475953 + ... + 520475956.

Almost surely, 2^2081903818 is an apocalyptic number.

2081903818 is a deficient number, since it is larger than the sum of its proper divisors (1040951912).

2081903818 is a wasteful number, since it uses less digits than its factorization.

2081903818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040951911.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 2081903818 is about 45627.8842156855. The cubic root of 2081903818 is about 1276.8902001937.

The spelling of 2081903818 in words is "two billion, eighty-one million, nine hundred three thousand, eight hundred eighteen".