1801936018 has 4 divisors (see below), whose sum is σ = 2702904030. Its totient is φ = 900968008.

The previous prime is 1801936009. The next prime is 1801936021. The reversal of 1801936018 is 8106391081.

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., 1409777209 + 392158809 = 37547^2 + 19803^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 450484003 + ... + 450484006.

Almost surely, 2^1801936018 is an apocalyptic number.

1801936018 is a deficient number, since it is larger than the sum of its proper divisors (900968012).

1801936018 is an equidigital number, since it uses as much as digits as its factorization.

1801936018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900968011.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1801936018 is about 42449.2169303510. The cubic root of 1801936018 is about 1216.8763633139.

The spelling of 1801936018 in words is "one billion, eight hundred one million, nine hundred thirty-six thousand, eighteen".