717997 has 6 divisors (see below), whose sum is σ = 835278. Its totient is φ = 615384.

The previous prime is 717989. The next prime is 718007. The reversal of 717997 is 799717.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 682276 + 35721 = 826^2 + 189^2 .

It is not a de Polignac number, because 717997 - 2³ = 717989 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (717917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7278 + ... + 7375.

It is an arithmetic number, because the mean of its divisors is an integer number (139213).

2⁷¹⁷⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

717997 is a deficient number, since it is larger than the sum of its proper divisors (117281).

717997 is a wasteful number, since it uses less digits than its factorization.

717997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14667 (or 14660 counting only the distinct ones).

The product of its digits is 27783, while the sum is 40.

The square root of 717997 is about 847.3470363434. The cubic root of 717997 is about 89.5449042792.

The spelling of 717997 in words is "seven hundred seventeen thousand, nine hundred ninety-seven".