800240018 has 18 divisors (see below), whose sum is σ = 1220058837. Its totient is φ = 393659040.

The previous prime is 800240017. The next prime is 800240041. The reversal of 800240018 is 810042008.

It can be written as a sum of positive squares in 2 ways, for example, as 745672249 + 54567769 = 27307^2 + 7387^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=20003.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 800239975 and 800240002.

It is not an unprimeable number, because it can be changed into a prime (800240017) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3320378 + ... + 3320618.

Almost surely, 2^800240018 is an apocalyptic number.

800240018 is a deficient number, since it is larger than the sum of its proper divisors (419818819).

800240018 is an frugal number, since it uses more digits than its factorization.

800240018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 800240018 is about 28288.5138881490. The cubic root of 800240018 is about 928.4105961786.

Multiplying 800240018 by its product of nonzero digits (512), we get a square (409722889216 = 640096²).

The spelling of 800240018 in words is "eight hundred million, two hundred forty thousand, eighteen".