1997844 has 12 divisors (see below), whose sum is σ = 4661664. Its totient is φ = 665944.

The previous prime is 1997843. The next prime is 1997851. The reversal of 1997844 is 4487991.

1997844 is digitally balanced in base 5, 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 (12).

It is a junction number, because it is equal to n+sod(n) for n = 1997796 and 1997805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83232 + ... + 83255.

It is an arithmetic number, because the mean of its divisors is an integer number (388472).

2^1997844 is an apocalyptic number.

It is an amenable number.

1997844 is an abundant number, since it is smaller than the sum of its proper divisors (2663820).

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

1997844 is a wasteful number, since it uses less digits than its factorization.

1997844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166494 (or 166492 counting only the distinct ones).

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

The square root of 1997844 is about 1413.4510957228. The cubic root of 1997844 is about 125.9468155485.

The spelling of 1997844 in words is "one million, nine hundred ninety-seven thousand, eight hundred forty-four".