998503866 has 12 divisors (see below), whose sum is σ = 2163425082. Its totient is φ = 332834616.

The previous prime is 998503841. The next prime is 998503921. The reversal of 998503866 is 668305899.

It can be written as a sum of positive squares in only one way, i.e., 710489025 + 288014841 = 26655^2 + 16971^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27736201 + ... + 27736236.

Almost surely, 2^998503866 is an apocalyptic number.

998503866 is an abundant number, since it is smaller than the sum of its proper divisors (1164921216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998503866 is a wasteful number, since it uses less digits than its factorization.

998503866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55472445 (or 55472442 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 998503866 is about 31599.1117913146. Note that the first 3 decimals coincide. The cubic root of 998503866 is about 999.5010397467.

The spelling of 998503866 in words is "nine hundred ninety-eight million, five hundred three thousand, eight hundred sixty-six".