812646218 has 4 divisors (see below), whose sum is σ = 1218969330. Its totient is φ = 406323108.

The previous prime is 812646193. The next prime is 812646251.

It is a happy number.

812646218 is nontrivially palindromic in base 10.

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., 809573209 + 3073009 = 28453^2 + 1753^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203161553 + ... + 203161556.

Almost surely, 2^812646218 is an apocalyptic number.

812646218 is a deficient number, since it is larger than the sum of its proper divisors (406323112).

812646218 is a wasteful number, since it uses less digits than its factorization.

812646218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406323111.

The product of its digits is 36864, while the sum is 38.

The square root of 812646218 is about 28506.9503454859. The cubic root of 812646218 is about 933.1837612639.

The spelling of 812646218 in words is "eight hundred twelve million, six hundred forty-six thousand, two hundred eighteen".