818009 has 4 divisors (see below), whose sum is σ = 821520. Its totient is φ = 814500.

The previous prime is 817987. The next prime is 818011. The reversal of 818009 is 900818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-818009 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (818099) 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, 1379 + ... + 1880.

It is an arithmetic number, because the mean of its divisors is an integer number (205380).

2⁸¹⁸⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

818009 is a deficient number, since it is larger than the sum of its proper divisors (3511).

818009 is a wasteful number, since it uses less digits than its factorization.

818009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3510.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 818009 is about 904.4384998440. The cubic root of 818009 is about 93.5232005111.

The spelling of 818009 in words is "eight hundred eighteen thousand, nine".