998424 has 72 divisors (see below), whose sum is σ = 3156660. Its totient is φ = 284256.

The previous prime is 998423. The next prime is 998429. The reversal of 998424 is 424899.

It is a happy number.

998424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 6.

It is a zygodrome in base 2 and base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998423) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3387 + ... + 3669.

2⁹⁹⁸⁴²⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1578330).

998424 is an abundant number, since it is smaller than the sum of its proper divisors (2158236).

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

998424 is a wasteful number, since it uses less digits than its factorization.

998424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 295 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 998424 is about 999.2116892831. The cubic root of 998424 is about 99.9474390450.

The spelling of 998424 in words is "nine hundred ninety-eight thousand, four hundred twenty-four".