998440988 has 12 divisors (see below), whose sum is σ = 1747837392. Its totient is φ = 499058880.

The previous prime is 998440987. The next prime is 998441027. The reversal of 998440988 is 889044899.

It is a super-2 number, since 2×998440988² = 1993768813036832288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998440987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25928 + ... + 51663.

It is an arithmetic number, because the mean of its divisors is an integer number (145653116).

Almost surely, 2^998440988 is an apocalyptic number.

It is an amenable number.

998440988 is a deficient number, since it is larger than the sum of its proper divisors (749396404).

998440988 is a wasteful number, since it uses less digits than its factorization.

998440988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80812 (or 80810 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 59.

The square root of 998440988 is about 31598.1168426221. The cubic root of 998440988 is about 999.4800590416.

The spelling of 998440988 in words is "nine hundred ninety-eight million, four hundred forty thousand, nine hundred eighty-eight".