1319643938 has 18 divisors (see below), whose sum is σ = 2104146993. Its totient is φ = 620597920.

The previous prime is 1319643937. The next prime is 1319643953. The reversal of 1319643938 is 8393469131.

It can be written as a sum of positive squares in 2 ways, for example, as 1207771009 + 111872929 = 34753^2 + 10577^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=25687.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1319643892 and 1319643901.

It is not an unprimeable number, because it can be changed into a prime (1319643937) 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 8 ways as a sum of consecutive naturals, for example, 872603 + ... + 874113.

Almost surely, 2^1319643938 is an apocalyptic number.

1319643938 is a deficient number, since it is larger than the sum of its proper divisors (784503055).

1319643938 is an frugal number, since it uses more digits than its factorization.

1319643938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3058 (or 1530 counting only the distinct ones).

The product of its digits is 419904, while the sum is 47.

The square root of 1319643938 is about 36326.9037766777. The cubic root of 1319643938 is about 1096.8626687282.

The spelling of 1319643938 in words is "one billion, three hundred nineteen million, six hundred forty-three thousand, nine hundred thirty-eight".