998391880 has 32 divisors (see below), whose sum is σ = 2283213240. Its totient is φ = 392808960.

The previous prime is 998391839. The next prime is 998391881. The reversal of 998391880 is 88193899.

It can be written as a sum of positive squares in 4 ways, for example, as 491331556 + 507060324 = 22166^2 + 22518^2 .

It is not an unprimeable number, because it can be changed into a prime (998391881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202149 + ... + 207028.

Almost surely, 2^998391880 is an apocalyptic number.

It is an amenable number.

998391880 is an abundant number, since it is smaller than the sum of its proper divisors (1284821360).

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

998391880 is a wasteful number, since it uses less digits than its factorization.

998391880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409249 (or 409245 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 998391880 is about 31597.3397614419. The cubic root of 998391880 is about 999.4636724041.

The spelling of 998391880 in words is "nine hundred ninety-eight million, three hundred ninety-one thousand, eight hundred eighty".