1320340138 has 48 divisors (see below), whose sum is σ = 2227109976. Its totient is φ = 583188480.

The previous prime is 1320340129. The next prime is 1320340141. The reversal of 1320340138 is 8310430231.

It can be written as a sum of positive squares in 12 ways, for example, as 629859409 + 690480729 = 25097^2 + 26277^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11684370 + ... + 11684482.

Almost surely, 2^1320340138 is an apocalyptic number.

1320340138 is a deficient number, since it is larger than the sum of its proper divisors (906769838).

1320340138 is a wasteful number, since it uses less digits than its factorization.

1320340138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1320340138 is about 36336.4849428230. The cubic root of 1320340138 is about 1097.0555241689.

Adding to 1320340138 its reverse (8310430231), we get a palindrome (9630770369).

The spelling of 1320340138 in words is "one billion, three hundred twenty million, three hundred forty thousand, one hundred thirty-eight".