1800899818 has 4 divisors (see below), whose sum is σ = 2701349730. Its totient is φ = 900449908.

The previous prime is 1800899809. The next prime is 1800899831. The reversal of 1800899818 is 8189980081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8189980081 = 37 ⋅221350813.

It can be written as a sum of positive squares in only one way, i.e., 1662437529 + 138462289 = 40773^2 + 11767^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450224953 + ... + 450224956.

Almost surely, 2^1800899818 is an apocalyptic number.

1800899818 is a deficient number, since it is larger than the sum of its proper divisors (900449912).

1800899818 is an equidigital number, since it uses as much as digits as its factorization.

1800899818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900449911.

The product of its (nonzero) digits is 331776, while the sum is 52.

The square root of 1800899818 is about 42437.0100030622. The cubic root of 1800899818 is about 1216.6430644157.

The spelling of 1800899818 in words is "one billion, eight hundred million, eight hundred ninety-nine thousand, eight hundred eighteen".