717409 has 15 divisors (see below), whose sum is σ = 917985. Its totient is φ = 559020.

The previous prime is 717397. The next prime is 717413. The reversal of 717409 is 904717.

The square root of 717409 is 847.

It is a perfect power (a square), and thus also a powerful number.

717409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 717409 - 2⁹ = 716897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (717419) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 65214 + ... + 65224.

It is an arithmetic number, because the mean of its divisors is an integer number (61199).

2⁷¹⁷⁴⁰⁹ is an apocalyptic number.

717409 is the 847-th square number.

717409 is the 424-th centered octagonal number.

It is an amenable number.

717409 is a deficient number, since it is larger than the sum of its proper divisors (200576).

717409 is an frugal number, since it uses more digits than its factorization.

717409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The cubic root of 717409 is about 89.5204534884.

Multiplying 717409 by its product of nonzero digits (1764), we get a square (1265509476 = 35574²).

The spelling of 717409 in words is "seven hundred seventeen thousand, four hundred nine".