1978939448 has 16 divisors (see below), whose sum is σ = 3738837960. Its totient is φ = 981916000.

The previous prime is 1978939441. The next prime is 1978939483. The reversal of 1978939448 is 8449398791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978939441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943103 + ... + 945198.

Almost surely, 2^1978939448 is an apocalyptic number.

It is an amenable number.

1978939448 is a deficient number, since it is larger than the sum of its proper divisors (1759898512).

1978939448 is a wasteful number, since it uses less digits than its factorization.

1978939448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888438 (or 1888434 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 62.

The square root of 1978939448 is about 44485.2722594793. The cubic root of 1978939448 is about 1255.4829964746.

The spelling of 1978939448 in words is "one billion, nine hundred seventy-eight million, nine hundred thirty-nine thousand, four hundred forty-eight".