1968445738 has 12 divisors (see below), whose sum is σ = 3434737122. Its totient is φ = 843619560.

The previous prime is 1968445667. The next prime is 1968445741. The reversal of 1968445738 is 8375448691.

It can be written as a sum of positive squares in only one way, i.e., 1664884809 + 303560929 = 40803^2 + 17423^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10042993 + ... + 10043188.

Almost surely, 2^1968445738 is an apocalyptic number.

1968445738 is a deficient number, since it is larger than the sum of its proper divisors (1466291384).

1968445738 is a wasteful number, since it uses less digits than its factorization.

1968445738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20086197 (or 20086190 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The square root of 1968445738 is about 44367.1695964482. The cubic root of 1968445738 is about 1253.2599150790.

The spelling of 1968445738 in words is "one billion, nine hundred sixty-eight million, four hundred forty-five thousand, seven hundred thirty-eight".