818191340 has 12 divisors (see below), whose sum is σ = 1718201856. Its totient is φ = 327276528.

The previous prime is 818191327. The next prime is 818191349. The reversal of 818191340 is 43191818.

818191340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 818191340.

It is not an unprimeable number, because it can be changed into a prime (818191349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20454764 + ... + 20454803.

It is an arithmetic number, because the mean of its divisors is an integer number (143183488).

Almost surely, 2^818191340 is an apocalyptic number.

It is an amenable number.

818191340 is an abundant number, since it is smaller than the sum of its proper divisors (900010516).

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

818191340 is a wasteful number, since it uses less digits than its factorization.

818191340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40909576 (or 40909574 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 818191340 is about 28604.0441196695. The cubic root of 818191340 is about 935.3014898944.

The spelling of 818191340 in words is "eight hundred eighteen million, one hundred ninety-one thousand, three hundred forty".