1978419713 has 2 divisors, whose sum is σ = 1978419714. Its totient is φ = 1978419712.

The previous prime is 1978419697. The next prime is 1978419791. The reversal of 1978419713 is 3179148791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1639602064 + 338817649 = 40492^2 + 18407^2 .

It is a cyclic number.

It is not a de Polignac number, because 1978419713 - 2⁴ = 1978419697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1978412713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989209856 + 989209857.

It is an arithmetic number, because the mean of its divisors is an integer number (989209857).

Almost surely, 2^1978419713 is an apocalyptic number.

It is an amenable number.

1978419713 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978419713 is an equidigital number, since it uses as much as digits as its factorization.

1978419713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 50.

The square root of 1978419713 is about 44479.4302234190. The cubic root of 1978419713 is about 1255.3730763877.

The spelling of 1978419713 in words is "one billion, nine hundred seventy-eight million, four hundred nineteen thousand, seven hundred thirteen".