997709 has 4 divisors (see below), whose sum is σ = 1050240. Its totient is φ = 945180.

The previous prime is 997699. The next prime is 997727. The reversal of 997709 is 907799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 907799 = 307 ⋅2957.

It is a cyclic number.

It is not a de Polignac number, because 997709 - 2⁴ = 997693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997739) 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, 26237 + ... + 26274.

It is an arithmetic number, because the mean of its divisors is an integer number (262560).

2⁹⁹⁷⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

997709 is a deficient number, since it is larger than the sum of its proper divisors (52531).

997709 is a wasteful number, since it uses less digits than its factorization.

997709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52530.

The product of its (nonzero) digits is 35721, while the sum is 41.

The square root of 997709 is about 998.8538431623. The cubic root of 997709 is about 99.9235749403.

The spelling of 997709 in words is "nine hundred ninety-seven thousand, seven hundred nine".