1315981338 has 48 divisors (see below), whose sum is σ = 3065042304. Its totient is φ = 375580800.

The previous prime is 1315981327. The next prime is 1315981367. The reversal of 1315981338 is 8331895131.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1315981338.

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, 351231 + ... + 354957.

It is an arithmetic number, because the mean of its divisors is an integer number (63855048).

Almost surely, 2^1315981338 is an apocalyptic number.

1315981338 is an abundant number, since it is smaller than the sum of its proper divisors (1749060966).

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

1315981338 is a wasteful number, since it uses less digits than its factorization.

1315981338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4947 (or 4940 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 1315981338 is about 36276.4570761810. The cubic root of 1315981338 is about 1095.8469675735.

The spelling of 1315981338 in words is "one billion, three hundred fifteen million, nine hundred eighty-one thousand, three hundred thirty-eight".