997744 has 20 divisors (see below), whose sum is σ = 2109240. Its totient is φ = 453440.

The previous prime is 997741. The next prime is 997751. The reversal of 997744 is 447799.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 997697 and 997706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997741) 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, 2659 + ... + 3010.

It is an arithmetic number, because the mean of its divisors is an integer number (105462).

2⁹⁹⁷⁷⁴⁴ is an apocalyptic number.

It is an amenable number.

997744 is an abundant number, since it is smaller than the sum of its proper divisors (1111496).

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

997744 is a wasteful number, since it uses less digits than its factorization.

997744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5688 (or 5682 counting only the distinct ones).

The product of its digits is 63504, while the sum is 40.

The square root of 997744 is about 998.8713630894. The cubic root of 997744 is about 99.9247433786.

Subtracting from 997744 its reverse (447799), we obtain a palindrome (549945).

The spelling of 997744 in words is "nine hundred ninety-seven thousand, seven hundred forty-four".