818401788 has 72 divisors (see below), whose sum is σ = 2134117440. Its totient is φ = 264297600.

The previous prime is 818401723. The next prime is 818401789. The reversal of 818401788 is 887104818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818401789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168498 + ... + 173286.

It is an arithmetic number, because the mean of its divisors is an integer number (29640520).

Almost surely, 2^818401788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818401788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1067058720).

818401788 is an abundant number, since it is smaller than the sum of its proper divisors (1315715652).

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

818401788 is a wasteful number, since it uses less digits than its factorization.

818401788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4947 (or 4942 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 45.

The square root of 818401788 is about 28607.7225238221. The cubic root of 818401788 is about 935.3816730353.

The spelling of 818401788 in words is "eight hundred eighteen million, four hundred one thousand, seven hundred eighty-eight".