1978419712 has 20 divisors (see below), whose sum is σ = 3952976346. Its totient is φ = 989209600.

The previous prime is 1978419697. The next prime is 1978419713. The reversal of 1978419712 is 2179148791.

It can be written as a sum of positive squares in only one way, i.e., 1892598016 + 85821696 = 43504^2 + 9264^2 .

It is not an unprimeable number, because it can be changed into a prime (1978419713) 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 as a sum of consecutive naturals, namely, 1931539 + ... + 1932562.

Almost surely, 2^1978419712 is an apocalyptic number.

It is an amenable number.

1978419712 is a deficient number, since it is larger than the sum of its proper divisors (1974556634).

1978419712 is an frugal number, since it uses more digits than its factorization.

1978419712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864119 (or 3864103 counting only the distinct ones).

The product of its digits is 254016, while the sum is 49.

The square root of 1978419712 is about 44479.4302121779. The cubic root of 1978419712 is about 1255.3730761762.

The spelling of 1978419712 in words is "one billion, nine hundred seventy-eight million, four hundred nineteen thousand, seven hundred twelve".