997716 has 48 divisors (see below), whose sum is σ = 2499840. Its totient is φ = 309120.

The previous prime is 997699. The next prime is 997727. The reversal of 997716 is 617799.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 997716.

It is an unprimeable number.

997716 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 15 ways as a sum of consecutive naturals, for example, 16326 + ... + 16386.

It is an arithmetic number, because the mean of its divisors is an integer number (52080).

2⁹⁹⁷⁷¹⁶ 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 997716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1249920).

997716 is an abundant number, since it is smaller than the sum of its proper divisors (1502124).

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

997716 is a wasteful number, since it uses less digits than its factorization.

997716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 142 counting only the distinct ones).

The product of its digits is 23814, while the sum is 39.

The square root of 997716 is about 998.8573471723. The cubic root of 997716 is about 99.9238086302.

The spelling of 997716 in words is "nine hundred ninety-seven thousand, seven hundred sixteen".