2318387840 has 32 divisors (see below), whose sum is σ = 5542397460. Its totient is φ = 927354880.

The previous prime is 2318387839. The next prime is 2318387849. The reversal of 2318387840 is 487838132.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1894686784 + 423701056 = 43528^2 + 20584^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 2318387791 and 2318387800.

It is not an unprimeable number, because it can be changed into a prime (2318387849) 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, 1810601 + ... + 1811880.

Almost surely, 2^2318387840 is an apocalyptic number.

2318387840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2318387840 is an abundant number, since it is smaller than the sum of its proper divisors (3224009620).

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

2318387840 is an equidigital number, since it uses as much as digits as its factorization.

2318387840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622500 (or 3622488 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 2318387840 is about 48149.6400817285. The cubic root of 2318387840 is about 1323.5144789570.

The spelling of 2318387840 in words is "two billion, three hundred eighteen million, three hundred eighty-seven thousand, eight hundred forty".