717998 has 4 divisors (see below), whose sum is σ = 1077000. Its totient is φ = 358998.

The previous prime is 717989. The next prime is 718007. The reversal of 717998 is 899717.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (717989) and next prime (718007).

It is a super-2 number, since 2×717998² = 1031042256008, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 717998.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 179498 + ... + 179501.

It is an arithmetic number, because the mean of its divisors is an integer number (269250).

2⁷¹⁷⁹⁹⁸ is an apocalyptic number.

717998 is a deficient number, since it is larger than the sum of its proper divisors (359002).

717998 is a wasteful number, since it uses less digits than its factorization.

717998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359001.

The product of its digits is 31752, while the sum is 41.

The square root of 717998 is about 847.3476264202. The cubic root of 717998 is about 89.5449458508.

The spelling of 717998 in words is "seven hundred seventeen thousand, nine hundred ninety-eight".