1998424 has 16 divisors (see below), whose sum is σ = 3910320. Its totient is φ = 955680.

The previous prime is 1998413. The next prime is 1998427. The reversal of 1998424 is 4248991.

It is a happy number.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5247 + ... + 5614.

It is an arithmetic number, because the mean of its divisors is an integer number (244395).

2^1998424 is an apocalyptic number.

It is an amenable number.

1998424 is a deficient number, since it is larger than the sum of its proper divisors (1911896).

1998424 is a wasteful number, since it uses less digits than its factorization.

1998424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10890 (or 10886 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 1998424 is about 1413.6562524178. The cubic root of 1998424 is about 125.9590023668.

The spelling of 1998424 in words is "one million, nine hundred ninety-eight thousand, four hundred twenty-four".