813818438 has 8 divisors (see below), whose sum is σ = 1220946888. Its totient is φ = 406836144.

The previous prime is 813818437. The next prime is 813818459. The reversal of 813818438 is 834818318.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813818437) by changing a digit.

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, 21356 + ... + 45647.

It is an arithmetic number, because the mean of its divisors is an integer number (152618361).

Almost surely, 2^813818438 is an apocalyptic number.

813818438 is a deficient number, since it is larger than the sum of its proper divisors (407128450).

813818438 is a wasteful number, since it uses less digits than its factorization.

813818438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73078.

The product of its digits is 147456, while the sum is 44.

The square root of 813818438 is about 28527.5031855226. The cubic root of 813818438 is about 933.6322430647.

The spelling of 813818438 in words is "eight hundred thirteen million, eight hundred eighteen thousand, four hundred thirty-eight".