1997824 has 22 divisors (see below), whose sum is σ = 3995744. Its totient is φ = 998400.

The previous prime is 1997813. The next prime is 1997833. The reversal of 1997824 is 4287991.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49 + ... + 1999.

2^1997824 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 1997824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1997872).

1997824 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1997824 is an equidigital number, since it uses as much as digits as its factorization.

1997824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1971 (or 1953 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 1997824 is about 1413.4440208229. Note that the first 3 decimals coincide. The cubic root of 1997824 is about 125.9463952713.

It can be divided in two parts, 19978 and 24, that added together give a palindrome (20002).

The spelling of 1997824 in words is "one million, nine hundred ninety-seven thousand, eight hundred twenty-four".