1320638244 has 24 divisors (see below), whose sum is σ = 3243673440. Its totient is φ = 417043584.

The previous prime is 1320638213. The next prime is 1320638261. The reversal of 1320638244 is 4428360231.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2895909 + ... + 2896364.

It is an arithmetic number, because the mean of its divisors is an integer number (135153060).

Almost surely, 2^1320638244 is an apocalyptic number.

It is an amenable number.

1320638244 is an abundant number, since it is smaller than the sum of its proper divisors (1923035196).

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

1320638244 is a wasteful number, since it uses less digits than its factorization.

1320638244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5792299 (or 5792297 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 1320638244 is about 36340.5867316421. The cubic root of 1320638244 is about 1097.1380822449.

Adding to 1320638244 its reverse (4428360231), we get a palindrome (5748998475).

The spelling of 1320638244 in words is "one billion, three hundred twenty million, six hundred thirty-eight thousand, two hundred forty-four".