812018 has 8 divisors (see below), whose sum is σ = 1229148. Its totient is φ = 402304.

The previous prime is 812011. The next prime is 812033. The reversal of 812018 is 810218.

It can be written as a sum of positive squares in 2 ways, for example, as 677329 + 134689 = 823^2 + 367^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (812011) by changing a digit.

812018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1571 + ... + 2022.

2⁸¹²⁰¹⁸ is an apocalyptic number.

812018 is a deficient number, since it is larger than the sum of its proper divisors (417130).

812018 is a wasteful number, since it uses less digits than its factorization.

812018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3708.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 812018 is about 901.1204137073. The cubic root of 812018 is about 93.2943232666.

The spelling of 812018 in words is "eight hundred twelve thousand, eighteen".