718009 has 4 divisors (see below), whose sum is σ = 725220. Its totient is φ = 710800.

The previous prime is 718007. The next prime is 718043. The reversal of 718009 is 900817.

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

It can be written as a sum of positive squares in 2 ways, for example, as 426409 + 291600 = 653^2 + 540^2 .

It is a cyclic number.

It is not a de Polignac number, because 718009 - 2¹ = 718007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (718007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3454 + ... + 3655.

It is an arithmetic number, because the mean of its divisors is an integer number (181305).

2⁷¹⁸⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

718009 is a deficient number, since it is larger than the sum of its proper divisors (7211).

718009 is a wasteful number, since it uses less digits than its factorization.

718009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7210.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 718009 is about 847.3541172379. The cubic root of 718009 is about 89.5454031359.

The spelling of 718009 in words is "seven hundred eighteen thousand, nine".