717490397 has 4 divisors (see below), whose sum is σ = 772681980. Its totient is φ = 662298816.

The previous prime is 717490387. The next prime is 717490399. The reversal of 717490397 is 793094717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793094717 = 23 ⋅34482379.

It can be written as a sum of positive squares in 2 ways, for example, as 60388441 + 657101956 = 7771^2 + 25634^2 .

It is a cyclic number.

It is not a de Polignac number, because 717490397 - 2¹⁰ = 717489373 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 (717490399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27595772 + ... + 27595797.

It is an arithmetic number, because the mean of its divisors is an integer number (193170495).

Almost surely, 2^717490397 is an apocalyptic number.

It is an amenable number.

717490397 is a deficient number, since it is larger than the sum of its proper divisors (55191583).

717490397 is a wasteful number, since it uses less digits than its factorization.

717490397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55191582.

The product of its (nonzero) digits is 333396, while the sum is 47.

The square root of 717490397 is about 26786.0112185447. The cubic root of 717490397 is about 895.2383901452.

The spelling of 717490397 in words is "seven hundred seventeen million, four hundred ninety thousand, three hundred ninety-seven".