1998201802 has 4 divisors (see below), whose sum is σ = 2997302706. Its totient is φ = 999100900.

The previous prime is 1998201791. The next prime is 1998201853. The reversal of 1998201802 is 2081028991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2081028991 = 643 ⋅3236437.

It can be written as a sum of positive squares in only one way, i.e., 1775863881 + 222337921 = 42141^2 + 14911^2 .

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, 499550449 + ... + 499550452.

Almost surely, 2^1998201802 is an apocalyptic number.

1998201802 is a deficient number, since it is larger than the sum of its proper divisors (999100904).

1998201802 is an equidigital number, since it uses as much as digits as its factorization.

1998201802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999100903.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 1998201802 is about 44701.2505641621. The cubic root of 1998201802 is about 1259.5433387537.

The spelling of 1998201802 in words is "one billion, nine hundred ninety-eight million, two hundred one thousand, eight hundred two".