1998744 has 64 divisors (see below), whose sum is σ = 5581440. Its totient is φ = 591360.

The previous prime is 1998739. The next prime is 1998761. The reversal of 1998744 is 4478991.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1998696 and 1998705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17632 + ... + 17744.

It is an arithmetic number, because the mean of its divisors is an integer number (87210).

2^1998744 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 1998744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2790720).

1998744 is an abundant number, since it is smaller than the sum of its proper divisors (3582696).

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

1998744 is a wasteful number, since it uses less digits than its factorization.

1998744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 196 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 1998744 is about 1413.7694295747. The cubic root of 1998744 is about 125.9657251192.

The spelling of 1998744 in words is "one million, nine hundred ninety-eight thousand, seven hundred forty-four".