998700840 has 224 divisors, whose sum is σ = 3488200200. Its totient is φ = 256919040.

The previous prime is 998700823. The next prime is 998700851. The reversal of 998700840 is 48007899.

It can be written as a sum of positive squares in 4 ways, for example, as 957407364 + 41293476 = 30942^2 + 6426^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 845050 + ... + 846230.

Almost surely, 2^998700840 is an apocalyptic number.

998700840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998700840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1744100100).

998700840 is an abundant number, since it is smaller than the sum of its proper divisors (2489499360).

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

998700840 is a wasteful number, since it uses less digits than its factorization.

998700840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239 (or 1220 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 998700840 is about 31602.2284024402. The cubic root of 998700840 is about 999.5667589960.

The spelling of 998700840 in words is "nine hundred ninety-eight million, seven hundred thousand, eight hundred forty".