818811438 has 8 divisors (see below), whose sum is σ = 1637622888. Its totient is φ = 272937144.

The previous prime is 818811437. The next prime is 818811449. The reversal of 818811438 is 834118818.

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

818811438 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 818811438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818811437) 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 3 ways as a sum of consecutive naturals, for example, 68234281 + ... + 68234292.

It is an arithmetic number, because the mean of its divisors is an integer number (204702861).

Almost surely, 2^818811438 is an apocalyptic number.

818811438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

818811438 is a wasteful number, since it uses less digits than its factorization.

818811438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136468578.

The product of its digits is 49152, while the sum is 42.

The square root of 818811438 is about 28614.8814081065. The cubic root of 818811438 is about 935.5377150482.

The spelling of 818811438 in words is "eight hundred eighteen million, eight hundred eleven thousand, four hundred thirty-eight".