997717 has 8 divisors (see below), whose sum is σ = 1190016. Its totient is φ = 817872.

The previous prime is 997699. The next prime is 997727. The reversal of 997717 is 717799.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 997717 - 2⁷ = 997589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 997717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2938 + ... + 3259.

It is an arithmetic number, because the mean of its divisors is an integer number (148752).

2⁹⁹⁷⁷¹⁷ is an apocalyptic number.

It is an amenable number.

997717 is a deficient number, since it is larger than the sum of its proper divisors (192299).

997717 is a wasteful number, since it uses less digits than its factorization.

997717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6227.

The product of its digits is 27783, while the sum is 40.

The square root of 997717 is about 998.8578477441. The cubic root of 997717 is about 99.9238420143.

The spelling of 997717 in words is "nine hundred ninety-seven thousand, seven hundred seventeen".