998844420 has 144 divisors (see below), whose sum is σ = 3329460288. Its totient is φ = 222969600.

The previous prime is 998844389. The next prime is 998844433. The reversal of 998844420 is 24448899.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 998844420.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 122470 + ... + 130370.

It is an arithmetic number, because the mean of its divisors is an integer number (23121252).

Almost surely, 2^998844420 is an apocalyptic number.

It is a pronic number, being equal to 31604×31605.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998844420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1664730144).

998844420 is an abundant number, since it is smaller than the sum of its proper divisors (2330615868).

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

998844420 is a wasteful number, since it uses less digits than its factorization.

998844420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7970 (or 7961 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The square root of 998844420 is about 31604.4999960449. The cubic root of 998844420 is about 999.6146581974.

The spelling of 998844420 in words is "nine hundred ninety-eight million, eight hundred forty-four thousand, four hundred twenty".