800018 has 4 divisors (see below), whose sum is σ = 1200030. Its totient is φ = 400008.

The previous prime is 800011. The next prime is 800029. The reversal of 800018 is 810008.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 494209 + 305809 = 703^2 + 553^2 .

800018 is a modest number, since divided by 18 gives 8 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 799969 and 800005.

It is not an unprimeable number, because it can be changed into a prime (800011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200003 + ... + 200006.

2⁸⁰⁰⁰¹⁸ is an apocalyptic number.

800018 is a deficient number, since it is larger than the sum of its proper divisors (400012).

800018 is a wasteful number, since it uses less digits than its factorization.

800018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400011.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 800018 is about 894.4372532492. The cubic root of 800018 is about 92.8324729054.

The spelling of 800018 in words is "eight hundred thousand, eighteen".