1998444 has 48 divisors (see below), whose sum is σ = 5481728. Its totient is φ = 554688.

The previous prime is 1998443. The next prime is 1998449. The reversal of 1998444 is 4448991.

It is a super-2 number, since 2×1998444² = 7987556842272, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2787 + ... + 3429.

2^1998444 is an apocalyptic number.

1998444 is a gapful number since it is divisible by the number (14) 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 1998444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2740864).

1998444 is an abundant number, since it is smaller than the sum of its proper divisors (3483284).

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

1998444 is a wasteful number, since it uses less digits than its factorization.

1998444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 692 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 1998444 is about 1413.6633262556. The cubic root of 1998444 is about 125.9594225598.

It can be divided in two parts, 1998 and 444, that added together give a palindrome (2442).

The spelling of 1998444 in words is "one million, nine hundred ninety-eight thousand, four hundred forty-four".