997509 has 8 divisors (see below), whose sum is σ = 1408320. Its totient is φ = 625856.

The previous prime is 997463. The next prime is 997511. The reversal of 997509 is 905799.

997509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 997509 - 2¹¹ = 995461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997589) 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, 9729 + ... + 9830.

It is an arithmetic number, because the mean of its divisors is an integer number (176040).

2⁹⁹⁷⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

997509 is a deficient number, since it is larger than the sum of its proper divisors (410811).

997509 is a wasteful number, since it uses less digits than its factorization.

997509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19579.

The product of its (nonzero) digits is 25515, while the sum is 39.

The square root of 997509 is about 998.7537233973. The cubic root of 997509 is about 99.9168976258.

The spelling of 997509 in words is "nine hundred ninety-seven thousand, five hundred nine".