818388740 has 24 divisors (see below), whose sum is σ = 1850818200. Its totient is φ = 302174208.

The previous prime is 818388733. The next prime is 818388757. The reversal of 818388740 is 47883818.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1800964 + 816587776 = 1342^2 + 28576^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1573565 + ... + 1574084.

It is an arithmetic number, because the mean of its divisors is an integer number (77117425).

Almost surely, 2^818388740 is an apocalyptic number.

It is an amenable number.

818388740 is an abundant number, since it is smaller than the sum of its proper divisors (1032429460).

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

818388740 is a wasteful number, since it uses less digits than its factorization.

818388740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3147671 (or 3147669 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 47.

The square root of 818388740 is about 28607.4944726028. The cubic root of 818388740 is about 935.3767019950.

The spelling of 818388740 in words is "eight hundred eighteen million, three hundred eighty-eight thousand, seven hundred forty".