813387818 has 16 divisors (see below), whose sum is σ = 1225664160. Its totient is φ = 404838000.

The previous prime is 813387811. The next prime is 813387859. The reversal of 813387818 is 818783318.

It is a super-2 number, since 2×813387818² = 1323199484941602248, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (813387811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 773393 + ... + 774443.

It is an arithmetic number, because the mean of its divisors is an integer number (76604010).

Almost surely, 2^813387818 is an apocalyptic number.

813387818 is a deficient number, since it is larger than the sum of its proper divisors (412276342).

813387818 is a wasteful number, since it uses less digits than its factorization.

813387818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2453.

The product of its digits is 258048, while the sum is 47.

The square root of 813387818 is about 28519.9547334844. The cubic root of 813387818 is about 933.4675414433.

The spelling of 813387818 in words is "eight hundred thirteen million, three hundred eighty-seven thousand, eight hundred eighteen".