997707 has 4 divisors (see below), whose sum is σ = 1330280. Its totient is φ = 665136.

The previous prime is 997699. The next prime is 997727. The reversal of 997707 is 707799.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 997707 - 2³ = 997699 is a prime.

It is a D-number.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 166282 + ... + 166287.

It is an arithmetic number, because the mean of its divisors is an integer number (332570).

2⁹⁹⁷⁷⁰⁷ is an apocalyptic number.

997707 is a deficient number, since it is larger than the sum of its proper divisors (332573).

997707 is a wasteful number, since it uses less digits than its factorization.

997707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332572.

The product of its (nonzero) digits is 27783, while the sum is 39.

The square root of 997707 is about 998.8528420143. The cubic root of 997707 is about 99.9235081716.

The spelling of 997707 in words is "nine hundred ninety-seven thousand, seven hundred seven".